Package Content: you will receive 4 pieces of RB741 FM135 remote control, which are for GTO, for Mighty Mule door opener; The built in instructions, sun visor, and built in 12V 23A battery are sufficient to meet your use and needs, and you can operate them well Compatibility List: RB741 FM135 remote control is for GTO, for Mighty Mule door opener, such as 350500502, MM260, MM271, MM360, MM371W, MM372W, MM560, MM562, MM571W, MM572W, MM600, MM660 and other 9 DIP switches, with 3 positions and a working frequency of 318MHZ Easy to Program and Carry: easy to operate and program, just follow the steps to complete your own code settings, highly safe and reliable, small size, light weight, easy to carry Supported Models: 350, 500, 502, MM260, MM271, MM360, MM371W, MM372W, MM560, MM562, MM571W, MM572W, MM600, MM660 and other nine three position DIP switches Safe and Reliable: after the upgrade, the latest RF technology and powerful security encryption design ensure a better working range, which can significantly reduce the radio wave interference signal reception and transmission range, up to 100 feet, and for Mighty Mule, for GTO opener; The highest level of encryption gives you peace of mind; Long distance stable operation Colour:Black Material:Plastic Package Contents: 4 * Gate Opener Remote Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.