The typical electric garage door opener consists of a power unit that contains the electric motor. The power unit attaches to a track. A trolley connected to an arm that attaches to the top of the garage door slides back and forth on the track, thus opening and closing the garage door. The recent stage of garage door opener.Market uses a frequency spectrum range between 300-400 MHz and most of the transmitter/receivers rely on hopping or rolling code technology. This approach prevents perpetrators from recording a code and replaying it to open a garage door. Since the signal is supposed to be significantly different from that of any other garage door remote control, manufacturers claim it is impossible for someone other than the owner of the remote to open the garage. When the transmitter sends a code, it generates a new code using an encoder. The receiver, after receiving a correct code, uses the same encoder with the same original seed to generate a new code that it will accept in the future. The latest generation of garage door opener systems. Is similar to third stage, but it is limited to the 315 MHz frequency. The 315 MHz frequency range avoids interference from the Land Mobile Radio System (LMRS) used by the U. Our 4th generation Garage door opener kit system has 430Mhz frquency. (FCC ID : ST9HT-228) & fit with most of US/Canada Garage door opener system. The control kit will control the existing wall switch for direct control instead of matching frequency. For button A control: White and yellow wire. For button B control: White and Green wire. Therefore, you can control 2 channels. (Only If your wall switch is 2 wire system). If your wall switch has more than 2 wires, it will be only control 1 Channel. The item "3 remote controls and gate garage door opener" is in sale since Thursday, March 09, 2017. This item is in the category "Home & Garden\Home Improvement\Building & Hardware\Garage Doors & Openers\Garage Door Remotes". The seller is "samitoelectronics" and is located in El Sobrante, California. This item can be shipped worldwide.