Input Voltage: 120 Vac; Rack mount AC/DC power supply can provide continuous power. Output DC voltage is highly regulated at 13.8 Volts (105-125 Volts, 50/60 Hz AC input). External battery can be connected for back-up and a section of output current (up-to 8 amps) is diverted to charge batteries when in state of discharge using in-built battery back-up module. Supplies DC load on loss of utility power. N+1 redundancy. Front panel analog Volt/Ampere meter display. Remote monitoring and indication by 25-pin D-sub connector. Fan failure warning and alarm indication. 19 in. L x 16.25 in. W x 3.5 in. H (27 lbs.). Ideal for critical power supply applications, telecommunication systems, mobile sound/audio displays, GPS receivers, security systems, CCTV systems.