Universal 433.92MHz Car Remote Control Clone Transmitter 4 Channel Keychain Duplicator for Garage Door Opener For Cars, Garage Doors, Gates, Alarm systems etc. Fixed frequency (433.92mhz) for copying 99.99% common fixed and learning code remote controls Face to face copy the functions of your original remote by this 4-channel RF remote control duplicator with code learning functions 4 buttons to operate 4 different garage doors or gates Easy to install and use