The Kingdder RB741 Remote Works Compatible with GTO RB741/FM135 Remote compatible with Mighty Mule Gate opener FM135 transmitter control single button gate controller. Transmitter Control is a set of two black, battery-operated remote controllers designed for garage doors. The single button controller is compatible with Mighty Mule products and is made of plastic. With a Kingdder brand and model RB741, this remote is a convenient and practical solution for controlling your garage door with ease.