Backup Line-Interactive UPS 900VA 480W EXPERT DESCRIPTION Compact Size Line Interactive Design Fully Digitized Microprocessor Control Auto Voltage Regulation (AVR) 50/60 Hz Frequency (Auto-Sensing) Generator Compatible Cold Start Function (DC Power On) Advanced Battery Management (ABM Technology) Advanced Green Mode Function Lightning and Surge Protection Short Circuit and Overload Protection EMI/RFI Noise Filter Automatic Charging When UPS is Off Audible Alarm & LED Power Status Display Smart RS-232/USB Communication Port* Network/Tel/Modem/Fax Spike Protection*