Futaba R3104SB 4-Channel 2.4GHz T-FHSS Receiver (S-Bus & HV) with Model ID (P-R3104SB)T FHSS AIR system for air and general receivers for air This is a 4 channel small receiver for T FHSS AIR system for air. The R3104SB is comes with the model ID function! S. BUS2 input output + conventional system output (ch1 4) What is the model ID function? The model data of each transmitter contains The model data of each transmitter is assigned a unique ID number (model ID). The receiver will not start unless the model data matches the ID stored