Gartt RadioLink RC4GS 2.4G 4CH Gun RC Transmitter with R6FG Gyro Receiver for RC Car Boat Code matched wirelessly Each transmitter has a unique identity code of its own. The receiver will search and bind with the nearest transmitter while pressing the code match button on it. There is no need to match again in future use once it matched successfully. 2.4GHz FHSS system, LCD screen, 10-model memory, Channel 4