Protect your electronics with this 6-outlet, 120-volt battery backup system. 300-watt back-UPS features a surge energy rating of 480 joules. Serial connection lets you use your PC to access additional power protection & management features for your uninterruptible power supply (UPS) through a serial port. Disconnected battery notification warns you when a battery is not available to provide backup power. Cold-start capability provides temporary battery power when the utility power is out. Dataline surge protection protects connected equipment from power surges on the data lines. Hot-swappable batteries ensure clean, uninterrupted power to your protected equipment while the batteries are being replaced. Wiring fault indicator informs you of potentially dangerous wiring problems in the wall circuit.