they are convenient and add security, while also giving you that extra ease of use necessary for everyday life.
the average electric garage door opener is a simple power unit that houses the electric opener. the power unit attaches to a track. next, a trolley connected to an arm is attached to the top of the garage door, which slides back and forth on the track, thus opening and closing the system.
the chain, screw, or belt pulls the trolley along the track and that turns when the motor is in use. a quick-release mechanism is attached to the trolley to allow the garage door to be disconnected from the opener for 