The three button entry transmitter is made to work with a Mighty Mule gate opener as well as up to two more garage door openers or gate openers. The transmitter has adjustable code setting for security, and it will open and close all Mighty Mule gate openers. An RB709 Garage Door Opener adapter is needed in order for the three button transmitter to communicate with each additional garage door opener. Comes with a visor clip for placement in your vehicle visor. 9 Volt battery included.