This APC BE650G1-CN External Back-UPS provides protection to your network against power surges, outages and spikes and ensures speedy recovery. Protect equipment with input transformer blocks without blocking access to other receptacles. Reserves power capacity and run time for connected equipment that require UPS battery back-up while providing surge only protection for less critical equipment. Protect secondary electronics from surges and spikes without reducing battery power used to run primary electronics during an outage. In addition, it performs periodic battery self-test ensures early detection of a battery that needs to be replaced.