KX-TD500

Capacity 192 CO Lines (max.) 448 Stations (max.) 512 Ports   Dialing Method Tone/Pulse   Dialing Conversion Tone to Pulse or Pulse to Tone   Switching Non-Blocking PCM Time Switch   Power Failure Transfer Function Yes   Power Failure Memory Back-up Seven years with factory-provided lithium battery   Power Failure System Operation Four hours using recommended batteries (consisting of two DC 12V 40 Ah automobile type batteries)   CO Line Amphenol Connector   Stations Amphenol Connector   Telephone Compatibility KX-T7400, T7700, T7800 series as well as Single Line Telephones   Paging Output Pin Jack (RCA Jack)   External Music Input 2-conductor jack   Power Source AC 120V, 60 Hz