GPT-1(GPT90-1) Compatible Stinger 390GED21V Garage Door Opener Visor Sized Remote One button 390MHz 12 Dip switch Remote Replaces models AT90, GT90, GT90-1, MAT90, CT90, LD12, PMT90-1, ALT90-1. Remote Includes: Battery, Instructions and Visor Clip Remotes are made to operate at a specific frequency for a specific opener. Please check dip switches the door opener has on it. If it has 12 then the unit will work perfectly. If they are 12 dip switches and it still doesn't work then kindly reverse the switches.