Employ’s Skylink’s rolling code technology. With most systems, there is only one assigned code. Smart Button GB-318. As a result, systems with rolling code technology are increasingly safe and secure.
Works fine if the remote is inside the garage, but can't receive a signal with the remote within a foot of the garage door. It cannot receive a signal through the door. I really don't know if the problem is with the remote or the receiver, but the system is not usable.