Product parameters: Frequency: 433.92MHz Encoding method: Rolling Code Battery model: CR2032 Size: 60 x 33 x 13mm Number of buttons: 4 channels Compatible brands and models: LiftMaster/Chamberlain: 94330E, 94333E, 94335E, 84330E, 84333E, 84335E, 1A5639-7, etc MotorLift: ML500, ML700, ML750, ML850, HC260ML, HC300ML, etc Other compatible systems: Garador, Catnic, Wickes, Merlin, PowerDrive and other models Incompatible models: 4330E, 4333E, 4335E (models without prefix 8 or 9) Packaging content: Remote control x 1 CR2032 battery x 1 Keyring x 1 English manual x 1 Programming instructions (brief version): Press the learning button on the motor (LED light on) Press the required button on the remote control The flashing motor light indicates successful programming Notes: Please confirm that the device frequency is 433MHz before use Some special models may not be compatible