For use with all Inter-M power amplifiers the PB-9207 allows the use of DC batteries for systems which require back-up in the event of mains failure. By continuous monitoring of the batteries the PB-9207 will automatically charge thus keeping the batteries in good condition until needed. Status and condition of the batteries is shown on a clear LED display on the front panel. Features: •1 large LED status/display shows volts and amps •DC input terminals (on rear) •Mains powered •2U high 19” rack mounting