APC Back UPS Pro BX850M, Compact Tower, 850VA, AVR, LCD, 120V - Tower - 12 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output - Single Phase - Stepped Approximated Sine Wave - 4 x NEMA 5-15R Surge, 4 x NEMA 5-15R Receptacle(s) - 8 x Battery