Yaoertai 4-Channel RF Wireless Remote Control Duplicator for Cars, Garage Doors , Gates doors, Alarm systems etc. Fixed frequency (433.92mhz or 315mhz) 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 and you'll always have a back up.Duplicate Your Existing Remote Controllers: Methods of operation1, Clear out code:Press A and Bat the same time,two seconds later,LEDflashes three times,followed by a continuous fast blinking.Indicates that the remote control code stored was deleted. 2, Duplicating (learning):RightHands press original remote control A, andleft hand press remote control duplicator A',2 remote controls put together as close as possible, while pressing the remote controls two match button,(eg: A-A,B-B) three seconds later, LED indicator light flashes three times, followed by a continuous fast blinking. That's mean successfully copied. 3, Recovery code:Press A and C at same time,20 seconds later,LED indicator light flashes three times,followed by a continuous fast blinking.This indicates that the original remote control codes have been restored.The other way, you can delete all and relearn them again.Methods of operation1, Clear out code:Press A and Bat the same time, two seconds later, LED flashes three times, followed by a continuous fast blinking. Indicates that the remote control code stored was deleted.2, Duplicating (learning)RightHands press original remote control A, andleft hand press remote control duplicator A', 2 remote controls put together as close as possible, while pressing the remote controls two match button,(eg: A-A’,B-B’) three seconds later, LED indicator light flashes three times, followed by a continuous fast blinking. That's mean successfully copied.3, Recovery codePress A and C at same time , 20 seconds later, LED indicator light flashes three times, followed by a continuous fast blinking. This indicates that the original remote control codes have been restored.The other way, you can delete all and relearn them again.Our company specializes in the design, development, manufacture andmarketing of such RF products as wireless receivers and transmitter modules, wireless remotecontrols, car alarm systems, home alarm systems and related accessories. We provide both OEM & ODMservices.