APC BK500 Back-UPS CS Battery Backup System Six-Outlet 500 Volt-Amps APWBK500 APW BK500, Combination of battery-protected and surge-only outlets reserves power capacity for connected equipment that requires battery back-up. Dataline Surge Protection provides protection of connected equipment on the data lines. Power conditioning protects connected loads from surges, spikes, lightning, and other disturbances. Audible alarms delivers notification of changing utility power and UPS conditions. Automatic restat of loads after UPS shutdown upon the return of utility power for exceptional convenience. Automatic battery self-test ensures early detection of a battery that needs to be replaced. Protection Type: N/A; System VA: 500 VA; Backup Time at Half Load: 13.9minutes @ 150 Watts; Lines: N/A., UPC 731304016304