Compatible with Code Hopping

 transmitters, factory coded (over 260 million combinations, 66 bit) 1, 3 & 4 channel transmitters and 1 & 3 channel receivers. (Up to 32 transmitters can be used with each 1 channel receiver and up to 8 transmitters with each 3 channel receiver) for up to 1000 users please refer to the SEN/H1000/R1, All transmitters have their own individual unique code)