Works great on an old Chamberlain 1/3 HP Security + opener, and the install is very simple. The only weirdness is that the indicator light is on the same side as the bolt attachment, so when you install the sensor, the indicator light is on the wrong side, and you can't see it. Also, I didn't really see how the wire connectors were supposed to work. I pushed a wire in, but it just fell back out. I wasn't planning on using them anyway, as I already had the correct wire connectors there. I would buy this again for sure.