Battery-protected & surge-only outlets reserves power capacity & run time for connected equipment that require battery back-up. Power conditioning protects connected loads from surges, spikes, lightning, & other disturbances. Audible alarms provide notification of changing utility power & UPS conditions. Automatic battery self-test ensures early detection of a battery that needs to be replaced. Cold-start capable for temporary battery power when the utility power is out. Hot-swappable batteries delivers clean, uninterrupted power to protected equipment while batteries are being replaced. System VA: 550 VA; Backup Time at Half Load: 13.5 minutes @ 165 Watts; Automatic Voltage Regulation (AVR): No; Battery Recharge Time: 24 h.