Liftmaster/Chamberlain/Sentex amz890mx 3 Button Key Chain Garage Door Opener Remote Transmitter Can control up to three garage door openers, gates or MyQTM enabled light devices Features Security+2.0TM rolling code technology Compatible with all LiftMaster garage door openers manufactured since January 1993, and all 315MHz Programming, instructions included Includes Battery Remote Dimensions 2.5" X 1.25" X .5"