Note: This Model is 880 with 433 Mhz, it don&x27;t work with 915 Mhz Model 880 . so , They can&x27;t work each other.
Transmitter or Collar can&x27;t work separately ,
option :Transmitter only ,433BR,433OR,433YR , is for buyer whose transmitter or receiver collar is broken,then buy a transmitter or receiver collar separately .
if you no transmitter or receiver collar in hand, please buy complete set (
transmitter + receiver collar)