The Dell Vostro 3910 is designed to meet the demands of small businesses and home offices. Whether you’re managing documents or multitasking, this desktop delivers reliable performance. Firstly equipped with the latest Intel processors, the Dell Vostro provides the power you need for efficient computing. From data analysis to video conferencing, this desktop ensures smooth and fast operation. Furthermore the Dell Vostro features ample storage options, including SSD and HDD configurations. This means you can store all your essential files and applications without worrying about space constraints. With multiple connectivity options, the Dell Vostro makes it easy to connect your peripherals. Whether it’s USB, HDMI, or Ethernet, this desktop supports all your connectivity needs. The Dell Vostro 3910 is designed with security in mind. It includes features like TPM 2.0, which ensures your data is protected and secure. You can work with peace of mind, knowing your information is safe. In addition to its powerful performance and security features, the Dell Vostro 3910 is also energy efficient. It meets ENERGY STAR® standards, helping you reduce your energy consumption and save on utility bills. The compact design of the Dell Vostro makes it an ideal choice for any workspace. It fits easily on or under your desk, keeping your workspace organized and clutter-free. In conclusion, the Dell Vostro offers a perfect blend of performance, security, and efficiency. Upgrade your workspace with the Dell Vostro 3910 and enhance your productivity today. Specifications: CPU : Intel Core i5-12400 RAM : 4GB Storage : 1TB HDD OS : Ubuntu Linux 18.04 Part Number : 210-BCUD-I5
Specifications : Core I7-10700 8GB Ram DDR4 1TB SATA 7200RPM 3.5″ HDD Intel Iris Xe Graphics DOS With Original Asus Keyboard& Mouse 1 Year Warranty manufacturer link
The Lenovo ThinkCentre Desktop 11SE00A0EX delivers reliable performance with its Intel Core i3-12100 processor. As a result, it handles office applications, basic multitasking, and everyday computing tasks efficiently, making it ideal for students, home users, and small businesses. Equipped with 4GB of RAM and a 1TB HDD, this desktop provides sufficient memory and storage for files, documents, and media. In addition, it ensures smooth operation for everyday tasks and quick access to stored content. Therefore, users can complete work without interruptions or delays. The system comes with essential connectivity options, allowing easy connection to monitors, peripherals, and external drives. Furthermore, DOS is pre-installed, providing the flexibility to install a preferred operating system. Moreover, the compact tower design saves space while maintaining practical usability. Lenovo designed this ThinkCentre for reliability and longevity. Consequently, it adapts well to both office and home environments. Overall, this desktop combines dependable hardware, sufficient storage, and flexible software options, making it a practical choice for everyday computing. This Lenovo ThinkCentre i3 is a solid option for users seeking a durable, affordable, and reliable desktop solution. Specifications: Intel Core i3-12100 CPU for smooth performance 4GB RAM for basic multitasking 1TB HDD for ample storage DOS pre-installed for OS flexibility Essential connectivity, compact design for home or office
Specifications : Core I5-10400 8GB Ram DDR4 1TB SATA 7200RPM 3.5″ HDD Intel Iris Xe Graphics DOS With Original Asus Keyboard& Mouse 1 Year Warranty manufacturer link
HP 290 G4 MT Intel Core i5-10400 4GB DDR4 1TB HDD Integrated Intel UHD Graphics USB wired KBD/Optical mouse DOS 1Yr – 5L4S0ES PROCESSOR Intel Core i5 MEMORY 4GB STORAGE 1TB HDD GRAPHICS Integrated Intel UHD OPERATING SYSTEM Dos/No OS/Ubuntu WARRANTY 1-Year Specifications: HP 290 G4 MT Intel Core i5-10400 4GB DDR4 1TB HDD Integrated Intel UHD PROCESSOR Intel Core i5 MEMORY 4GB STORAGE 1TB HDD GRAPHICS Integrated Intel UHD OPERATING SYSTEM Dos/No OS/Ubuntu WARRANTY 1-Year
Looking for a hassle-free computing solution for your home? Meet the Dell Inspiron 5420 AIO, your all-in-one answer. With its sleek design and powerful performance, it’s everything you need in one package. Firstly, let’s talk about space-saving. Say goodbye to cluttered desks and tangled wires – the Inspiron 5420 AIO streamlines your setup with its compact design. Enjoy more desk space for work or play without sacrificing performance. Transitioning to performance, get ready for seamless multitasking with the Inspiron 5420 AIO’s robust processing power. From browsing the web to streaming your favorite movies, experience smooth and responsive performance every time. Moreover, its vibrant display ensures sharp visuals and vivid colors, making every movie night or gaming session more immersive. Whether you’re watching movies or editing photos, enjoy crisp and clear visuals with the Inspiron 5420 AIO. In addition, with its built-in webcam and microphone, stay connected with friends and family through video calls and virtual meetings. Enjoy crystal-clear audio and sharp video quality for a more engaging communication experience. Furthermore, the Inspiron 5420 AIO comes with ample storage space to store all your files, photos, and videos. Say goodbye to external hard drives and cloud storage subscriptions – keep everything you need right at your fingertips. In conclusion, the Dell Inspiron 5420 AIO is the ultimate all-in-one solution for home computing. From its space-saving design to its powerful performance and vibrant display, it’s the perfect addition to any home office or entertainment setup. Upgrade your home computing experience today with the Dell Inspiron 5420 AIO. Specifications: CPU : Intel Core i7-1355U RAM : 16GB Storage : 1TB HDD, 256GB SSD GPU : Intel Iris Xe OS : Windows 11 Screen : 23.8″ FHD (1920×1080) Touch Color : White Includes : Wireless Keyboard & Mouse Part Number : I5420-7166WHT-PUS
Add $30 to replace with ASUS 24″ VA24HE or Samsung 27″ LS27C310 Looking to boost the performance of your Asus desktop S500SC-5115000020 without breaking the bank? We’ve got you covered with practical and budget-friendly tips to enhance your computing experience. Start by upgrading your desktop’s RAM. Adding more memory can significantly improve speed and multitasking capabilities, making your Asus desktop run smoother during demanding tasks. Consider investing in a solid-state drive (SSD) for faster data access and quicker boot times. This simple upgrade can breathe new life into your desktop, providing a noticeable performance boost. Explore external storage options for additional space without the need for a complete hardware overhaul. External hard drives or cloud storage solutions seamlessly expand your storage capacity. Upgrade your graphics card for an enhanced visual experience, especially if you’re into gaming or graphic-intensive applications. Asus offers a range of graphics cards suitable for different needs and budgets. Ensure your desktop is equipped with the latest software updates. Regular updates not only improve security but also enhance overall system performance, keeping your Asus desktop S500SC-5115000020 running optimally. Invest in a comfortable and ergonomic keyboard and mouse for a more enjoyable computing experience. Asus offers a variety of affordable options that cater to both work and gaming preferences. Organize your desktop space with cable management solutions. Tidy cables not only improve the aesthetics of your workspace but also contribute to a more efficient and clutter-free environment. In conclusion, upgrading your Asus desktop S500SC-5115000020 doesn’t have to be costly. By following these affordable tips, you can enjoy a more efficient and enjoyable computing experience without straining your budget. Elevate your workspace today! Specifications: Case : S500SC CPU : Core i5-11500 PSU : Real 300W Board : Intel B560 RAM : 16GB Storage : 1TB + 256GB NVMe Include : USB English Keyboard and Mouse Part Number : S500SC-5115000020
Dell OptiPlex 3280 All-in-One Desktop 210-AVPP-I3 Tech Specs Processor 10th Gen Intel® Core™ i3-10105T (6 MB cache, 4 cores, 8 threads, 3.00 GHz to 3.90 GHz Turbo, 35 W) Operating System Windows 10 Pro (Windows 11 Pro license included), English, French, Spanish Graphics Card Intel® Integrated Graphics Monitor OptiPlex All-in-One Non-Touch Panel Memory * 8 GB, 1 x 8 GB, DDR4 Hard Drive 256 GB, M.2 2230, PCIe NVMe, SSD, Class 35 Security Software No anti-virus software Protect your purchase – View Support offers below * 3 Years Hardware Service with Onsite/In-Home Service After Remote Diagnosis Accidental Damage Service None Keyboard Dell KB216 Wired Keyboard English, US Specifications: Dell OptiPlex 3280 All-in-One Desktop Tech Specs Processor 10th Gen Intel® Core™ i3-10105T (6 MB cache, 4 cores, 8 threads, 3.00 GHz to 3.90 GHz Turbo, 35 W) Operating System Windows 10 Pro (Windows 11 Pro license included), English, French, Spanish Graphics Card Intel® Integrated Graphics Monitor OptiPlex All-in-One Non-Touch Panel 1 Year Warranty
Inspiron AIO DT 5410 210-BDST-I7 Pearl White Fabric 12th Generation Intel Core i7-1255U • 12th Generation Intel Core i7-1255U (12MB Cache, up to 4.4 GHz, 10 cores) • 16GB RAM • 256GB M.2 PCIe NVMe SSD + 1TB 5400 rpm 2.5″ SATA • 23.8-inch FHD (1920 x 1080) Anti-Glare Narrow Border AIT Infinity Touch Display • V-RAM: NVIDIA GeForce MX550 with 2GB GDDR6 graphics memory • Operating System: Windows 11 Home, Microsoft Office 30 Day Trial, McAfee Multi Device Security 36 Month Subscription • Warranty: 1 year • Color: Pearl White Fabric Specifications: Inspiron AIO DT 5410 210-BDST-I7 Pearl White Fabric 12th Generation Intel Core i7-1255U • 12th Generation Intel Core i7-1255U (12MB Cache, up to 4.4 GHz, 10 cores) • 16GB RAM • 256GB M.2 PCIe NVMe SSD + 1TB 5400 rpm 2.5″ SATA • 23.8-inch FHD (1920 x 1080) Anti-Glare Narrow Border AIT Infinity Touch Display 1 Year Warranty
The Dell Vostro 3910 DT is designed to meet the demands of small businesses and home offices. Whether you’re managing documents or multitasking, this desktop delivers reliable performance. Firstly equipped with the latest Intel processors, the Dell Vostro provides the power you need for efficient computing. From data analysis to video conferencing, this desktop ensures smooth and fast operation. Furthermore the Dell Vostro features ample storage options, including SSD and HDD configurations. This means you can store all your essential files and applications without worrying about space constraints. With multiple connectivity options, the Dell Vostro makes it easy to connect your peripherals. Whether it’s USB, HDMI, or Ethernet, this desktop supports all your connectivity needs. The Dell Vostro 3910 DT is designed with security in mind. It includes features like TPM 2.0, which ensures your data is protected and secure. You can work with peace of mind, knowing your information is safe. In addition to its powerful performance and security features, the Dell Vostro 3910 DT is also energy efficient. It meets ENERGY STAR® standards, helping you reduce your energy consumption and save on utility bills. The compact design of the Dell Vostro makes it an ideal choice for any workspace. It fits easily on or under your desk, keeping your workspace organized and clutter-free. In conclusion, the Dell Vostro offers a perfect blend of performance, security, and efficiency. Upgrade your workspace with the Dell Vostro 3910 DT and enhance your productivity today. Specifications: CPU : Intel Core i3-12100 RAM : 8GB Storage : 256GB SSD NVMe OS : Ubuntu Linux 18.04 Color : Black Part Number : 210-BCUD-I3
The SkyGate Mini DC UPS 20000mAh is a powerful and compact solution for uninterrupted power. Whether you need backup power for your router, modem, or other devices, this mini UPS has you covered. With a 20000mAh capacity, the SkyGate Mini DC UPS ensures your devices stay powered during outages or unexpected power cuts. This high-capacity battery provides extended usage time, keeping your essentials running smoothly. The SkyGate Mini DC UPS is designed for versatility, featuring multiple output options. It supports DC 9V/12V, USB 5V, and Type C, making it compatible with a wide range of devices, from routers to smartphones. Setting up the SkyGate Mini DC UPS is simple and hassle-free. Its plug-and-play functionality allows you to connect your devices quickly, ensuring uninterrupted power with minimal effort. The SkyGate Mini DC UPS is equipped with intelligent safety features, including overcharge protection, over-discharge protection, and short-circuit protection. These features ensure safe and reliable operation, protecting your devices from damage. Compact and portable, the SkyGate Mini DC UPS is easy to carry and store. Its lightweight design makes it perfect for use at home, in the office, or even on the go. In conclusion, the SkyGate Mini DC UPS 20000mAh offers reliable backup power with a high-capacity battery and versatile output options. Keep your devices running smoothly during power outages with this efficient and portable mini UPS. Specifications: Battery : 20000mAh Output Power : 18W POE Port : 24V/0.7A DC Port : 9V/2A, 12V/1.5A Output Ports : 5V/2A USB, 5V/1A Type-C
UPS battery 12V 7A Battery for UPS 7A 12v
The PROLINK PRO700 Line Interactive UPS is designed to provide reliable backup power and protection for computers, networking devices, and other electronic equipment. It helps maintain stable operation during power interruptions and voltage fluctuations. With a 650VA capacity and 360W output power, this UPS provides practical power support for home and office environments. Additionally, its line-interactive design with AVR technology helps regulate voltage and improve power stability. The PRO700 supports a wide input voltage range from 140V to 300V AC. Moreover, it automatically senses 50Hz or 60Hz input frequency, allowing compatibility with different power environments. The UPS provides simulated sine wave output during battery mode and sine wave output during AC mode. Furthermore, the fast transfer time helps reduce interruptions when switching to battery operation. The built-in 12V 8.2Ah battery provides backup power for connected devices during outages. Therefore, users can safely save work and shut down equipment during unexpected power failures. The PROLINK PRO700 includes protection features against short circuits, overloads, discharge, and overcharge conditions. In addition, its intelligent battery management helps improve battery protection and lifespan. The compact design makes the UPS suitable for desktops, network equipment, and small office setups. Also, its low noise operation allows comfortable use in different working environments. The PROLINK PRO700 Line Interactive UPS combines voltage regulation, backup power, and essential protection features in a compact solution. As a result, it provides dependable power support for everyday electronic devices. Specifications: Capacity: 650VA / 360W Input Voltage Range: 140V–300V AC ±5% Battery: 12V / 8.2Ah sealed lead-acid battery Output Waveform: Simulated sine wave (Battery Mode) Protection: Short circuit, overload, discharge, and overcharge protection
Powerology Portable Power Generator,140400mAh Powerology 140400mAh Power Generator 500W Pure Sine-Wave Output -45W USB-C Power Delivery -18W USB-A Quick Charge -3.1A Dual USB Optimal Charge -220V UK AC Output -750W Max Surge
PCE EX Online 3 KVA 2700W is a double-conversion online UPS designed for continuous and stable power protection. It is used for sensitive equipment such as servers, network systems, and critical office devices that require uninterrupted electricity. In addition, PCE EX Online 3 KVA 2700W uses online double-conversion technology. Therefore, it provides zero transfer time between mains and battery mode. Moreover, it delivers clean and stable pure sine wave output for safe operation of connected devices. Furthermore, PCE EX Online 3 KVA 2700W supports a 3000VA / 2700W capacity rating. As a result, it can handle high-load systems such as multiple PCs and networking equipment. It also maintains consistent voltage regulation for sensitive electronics during unstable power conditions. In addition, PCE EX Online 3 KVA 2700W includes advanced protection features. Therefore, it guards against overload, short circuits, voltage fluctuations, and power failures. Moreover, it is designed for long-duration reliability in professional environments. Overall, PCE EX Online 3 KVA 2700W delivers strong performance, zero-interruption switching, and high-level protection for critical power backup needs. Specifications: 3000VA / 2700W high-capacity output Online double-conversion UPS technology Zero transfer time for uninterrupted power Pure sine wave output for sensitive devices Advanced protection against overload and faults
APC Easy UPS SRV, 1600 Watts / 2 KVA, Online double conversion, Sine wave, 230V, Multi-function LCD status and control console, Surge Protection and Filtering, Generator compatible, Management Software, USB, 2 years warranty Electronics and Battery
Prolink PRO3000SFCU 3000VA is a line-interactive UPS designed to provide stable backup power for PCs, servers, networking devices, and sensitive electronics. It ensures continuous operation during power cuts and voltage fluctuations. In addition, Prolink PRO3000SFCU 3000VA supports a wide input voltage range of 140–300VAC. Therefore, it stabilizes unstable electricity using automatic voltage regulation (AVR). Moreover, it delivers a fast transfer time of around 2ms for seamless switching between mains and battery mode. Furthermore, Prolink PRO3000SFCU 3000VA includes four 12V/10Ah batteries for extended backup support. As a result, it provides reliable runtime for critical systems depending on load. It also supports simulated sine wave output for compatible devices. In addition, Prolink PRO3000SFCU 3000VA features intelligent microprocessor control. Therefore, it improves efficiency, protection, and battery management. Moreover, it includes indicators and alarms for battery, overload, and fault conditions. Overall, Prolink PRO3000SFCU 3000VA delivers strong backup performance, stable voltage regulation, and reliable protection for home and office power needs. Specifications: 3000VA capacity for PCs and office equipment Line-interactive UPS with AVR voltage regulation Wide input range 140–300VAC for unstable power Fast ~2ms transfer time for uninterrupted switching Four 12V/10Ah batteries for extended backup support
The Beco GP1500 1500VA 900W UPS delivers strong and reliable power protection for home and office electronics. It keeps computers, routers, and monitors running during outages. This helps prevent data loss and sudden shutdowns. Peace of mind increases with reliable backup power. Moreover, the Beco GP1500 1500VA 900W UPS offers 1500 VA capacity and 900 W output for high-demand systems. It supports larger desktops and entertainment setups easily. Backup power stays strong during interruptions. This improves system stability every day. In addition, the UPS features built-in surge protection to guard appliances from spikes and unstable power. This adds important defense against electrical damage. Devices remain safe during storms and fluctuations. Safety stays consistent. Furthermore, the Beco GP1500 1500VA 900W UPS includes automatic voltage regulation to smooth dips and spikes. It balances voltage without manual adjustment. This helps extend device lifespan. Consistent power improves performance. Also, the UPS delivers dependable battery backup when electricity fails. You can save files and shut down properly before power runs out. This reduces the risk of data loss. Backup support feels reassuring. In addition, the Beco GP1500 1500VA 900W UPS has clear LED indicators for power and battery status. You can check conditions easily at a glance. This makes monitoring simple and fast. Moreover, the UPS includes multiple output sockets for connecting several devices at once. This increases flexibility for busy workstations and entertainment centers. You can protect all critical electronics with one unit. Furthermore, the Beco GP1500 1500VA 900W UPS supports quick plug-and-play setup with no complex steps. Installation feels easy for any user. Setup remains fast and hassle-free. Also, the compact and sturdy design fits neatly into workspaces or shelves. It blends well into home and office environments. Portability stays practical. Overall, the Beco GP1500 1500VA 900W UPS delivers strong battery backup, surge protection, and voltage regulation. It ensures steady power and protects electronics effectively. This UPS is ideal for users needing reliable, high-capacity power protection every day. Specifications: 1500VA, 900W, LED, Plastic Case Input: 140-290 VAC Output: 230VAC 50/60HZ 12V 9AH *2pcs, Universal Socket *4 + EU Plug With AVR, Bypass output Overload and short circuit protection
The PCE PCD 12V 100Ah Deep Cycle Battery delivers strong and reliable power for many applications. It offers a larger 100Ah capacity for extended use. This helps engines, systems, and devices run longer between charges. Users experience dependable energy when needed most. Moreover, the PCE PCD Deep Cycle Battery uses a deep cycle design built for repeated discharge and recharge. It supports long-term use without damage. This increases the battery’s lifespan and reduces replacements. Performance remains consistent over time. In addition, the battery provides a stable 12 V output for balanced power delivery. It suits solar systems, RVs, marine setups, and backup power solutions. Power stays steady for lights and appliances. Daily use becomes more efficient. Furthermore, the PCE PCD 12V 100Ah Deep Cycle Battery features a rugged casing that protects internal cells. The strong build resists wear and harsh conditions. This helps maintain performance in many environments. Durability feels reassuring. Also, the battery supports deep discharge recovery for long service life. It recovers well after heavy use cycles. This improves energy storage and reliability. Users rely on strong power anytime. In addition, the PCE PCD Deep Cycle Battery is easy to install in compatible racks and holders. Connections stay secure and simple. Setup feels user-friendly for both beginners and professionals. Installation remains smooth. Furthermore, the PCE PCD Deep Cycle Battery performs steadily across varying temperatures. It stays reliable in moderate heat and cold. This makes it ideal for outdoor and mobile use. Overall, the PCE PCD 12V 100Ah Deep Cycle Battery delivers dependable power, long life, and robust performance. It fits homes, boats, RVs, and solar systems. This battery is perfect for users who want strong, lasting deep cycle energy every day. Specifications: Voltage : 12V Capacity : 100Ah
The PCE Battery 12V 9Ah is a reliable and efficient power solution for various applications. Whether you need backup power for a UPS system or energy for your equipment, this battery ensures consistent performance. With a 12V output and 9Ah capacity, the PCE Battery delivers the power you need to keep your devices running smoothly. It’s ideal for use in security systems, emergency lighting, and other critical equipment. Designed for durability, the PCE Battery offers a long lifespan and requires minimal maintenance. Its sealed, lead-acid design ensures that it remains leak-proof and safe for use in different environments. The PCE Battery 12V 9Ah is compatible with a wide range of devices and systems. Whether you’re using it for home backup, industrial equipment, or a solar energy system, it provides dependable power when needed. This battery features advanced technology for efficient energy storage and reliable discharge. It also includes built-in safety features like overcharge and short-circuit protection, ensuring safe and stable operation. One of the key benefits of the PCE Battery is its easy installation. Whether you’re an expert or a beginner, this battery can be quickly installed and connected to your system with minimal effort. In conclusion, the PCE Battery 12V 9Ah is a perfect combination of reliability, performance, and safety. Choose this battery for a stable power supply and enjoy long-lasting energy for all your essential devices. Specifications: Voltage : 12V Capacity : 9Ah
The APC Smart-UPS RC 800W 1KVA Sine Wave SRC1KI provides reliable backup power for critical devices. First, it delivers pure sine wave output, ideal for sensitive electronics. In addition, the UPS protects connected equipment from power surges, spikes, and outages. Moreover, it features a compact design for easy placement in offices or server rooms. Finally, the unit includes an intuitive LCD interface for monitoring battery status and load. The SRC1KI ensures continuous operation and safeguards important systems during power interruptions. Specifications: 800W / 1KVA pure sine wave output for sensitive devices Protects against power surges, spikes, and outages Compact design for office or server room placement LCD interface for monitoring battery and load status Ensures continuous operation during power interruptions
The Twist Line Interactive UPS 1500VA TWUP1500/LI provides backup power protection for computers, networking devices, and office equipment. It uses line interactive technology with automatic voltage regulation for stable output performance. Additionally, the built-in dual 12V/7Ah batteries support continued operation during power interruptions. Moreover, the UPS includes LED status indicators for clear power monitoring and system alerts. It also supports overload and short-circuit protection for safer daily operation. Therefore, it helps protect connected devices from voltage fluctuations and sudden outages. Furthermore, the compact tower design fits home and office environments easily. The system also supports cold start functionality and simulated sine wave output for common electronic devices. Additionally, the automatic battery charging system improves operational reliability. Specifications: 1500VA line interactive UPS technology Built-in 2x12V/7Ah rechargeable batteries LED indicators for power status monitoring Automatic voltage regulation for stable output Overload and short-circuit protection system
The APC UPS 600W 1000VA Line Interactive BV1000I-GR provides reliable backup power for home and office devices. First, it delivers line-interactive output to protect equipment from voltage fluctuations. In addition, it safeguards connected devices against surges, spikes, and short outages. Moreover, the compact design allows easy placement on desks or near electronics. Finally, the UPS includes LED indicators to monitor battery and load status. The BV1000I-GR ensures uninterrupted operation and protects important electronics during power interruptions. Specifications: 600W / 1000VA line-interactive output protects devices Safeguards against power surges, spikes, and outages Compact design for easy placement on desks or near electronics LED indicators monitor battery and load status Ensures uninterrupted operation during short power interruptions
The Yuasa SWL2500T Industrial VRLA Battery delivers reliable power for industrial and backup applications. First, it provides consistent energy output for critical equipment and systems. In addition, the valve-regulated lead-acid (VRLA) technology ensures maintenance-free operation and extended service life. Moreover, the battery features durable construction, vibration resistance, and high discharge efficiency for demanding environments. The compact design allows easy installation in various setups. Finally, its dependable performance, safety features, and long-term reliability make it ideal for industrial, UPS, and emergency power systems. Specifications: VRLA Technology: Maintenance-free operation with long service life High Discharge Efficiency: Reliable power for critical equipment Durable Construction: Resistant to vibration and harsh environments Compact Design: Easy installation in various industrial setups Industrial Reliability: Ideal for UPS, backup, and emergency power