Remote Control
A wireless remote control can be carried or kept in a car kit. It puts control at your fingertips wherever you are and allows you to operate the machine or device in any circumstance. This saves you a lot of time and allows you to do more in the same amount of time. In specific cases
Flasher
flashers made to increase the safety to notify you when the motors is working and the door is closing or opening.
Photocell
Photocell is almost the most important safety wise in motors, if photocell not working the motor would not work too. its a laser cover the width infront of the door. if the door is closing and you intercept the laser of photocell the door will reverse the motion. if you cut the laser with any thing the door will not close never until you move.
Control Board
scpecific cases need a new control board or to complete the motor setup.