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Garage door opener drive mechanism.
The transmitter would transmit on a designated frequency.
It operates using a switch that activates the wide rubber belt which either pulls the trolley up a track to raise the door or pushes it down a track to lower the door.
The machine also slows a door in transit preventing it from crashing to the garage floor.
This type of drive system runs along the rail and wraps around a sprocket located on the top of the opener.
Belt drive garage door openers are almost similar to chain drive mechanisms but in this type of system a wide belt is used instead of a metal chain.
If this part of your screw drive garage door opener becomes damaged it can be difficult to repair or replace without removing the whole mechanism.
The first garage door opener remote controls were simple and consisted of a simple transmitter the remote and receiverwhich controlled the opener mechanism.
The best overall garage door opener is the chamberlain wd832kev whisper belt drive garage door opener view at home depot which requires little maintenance and is easy to install.
The belt ends are joined at the drive trolley with a threaded clip that can be adjusted to keep the belt tight.
The receiver would listen for the radio signal then open or close the garage depending on the door position.