Instruction ManualDigital Wireless Intercom SAMCOM FTAN20AA (FTAN20AB, FTAN20AC,FTAN20AD)Features of Model FTAN20AA (FTAN20AB, FTAN20AC,FTAN20AD)Simple to use" Instant" Intercom system.Individually LOCK, Talk and Group function.Connect ability to other hand held two way radio.Sancon Inc.1