The RTS F.01U.154.848 is an assembled PCB main board for the now disconinued Telex BP1002 Intercom Beltpacks. the BP1002 is a 1-Channel portable metal beltpack with call light, programmable mic kill detect and tone alert, dynamic/electret mic, headset jack (XLR-4M) & Balanced/Unbalanced operation. There are plenty left in the field that are still operable and here is a replacement PCB that will help to keep your system going for years to come.