The CyberPower Standby CP550SLG UPS safeguards a home office PC and other electronics (monitors, scanners, speakers, CD/DVD/MP3 players and more) from surges, sags, brownouts and other power disruptions. The CP550SLG provides surge protected, battery backup and features 550VA/330W capacity, GreenPower UPS technology, 8-NEMA 5-15P receptacles, (4 wide-spaced), Compact design, 1- USB port, phone/fax (RJ11) line protection, EMI/RFI filters, PowerPanel UPS management software , GreenPower UPS - Advanced energy-saving circuitry that reduces UPS energy costs by 75 percent, USB Connectivity - HID compliant USB port enables full integration with built-in power management and auto shutdown features of Windows, Linux and Mac OS X, EMI/RFI Filters - Shielding against electromagnetic interference and radio frequency signals prevents line noise (humming) over telephone lines or audio systems, Transformer-Spaced Outlets and#8211, Widely-spaced outlets accommodate large transformer-based plugs, Mounting and 8211, mounting options: horizontal, vertical, cabinet, and wall , LED Indicators/Audible Alarms - LED status lights indicate Power-On and wiring faults / Distinctive tones identify when the unit is running on battery power, is overloaded or when the battery is low.