Garage door remotes model GTX2 or GTX-2E is obsoleted, upgrade with sync kit Gliderol 702 which is composed of two key ring remotes. It's DIY kit that don't need any technical skill.
The kit Gliderol 701 is with one remote only.
To hook up is very simple: That just a plug-in installation in a minute.
This one is upgraded to Gliderol 702.
This one is upgraded to Gliderol 701.