Description: This transmitter can be programmed to control up to three compatible home or office devices such as garage doors, automatic gates or security lights. The system can be used to replace several remote handsets with one convenient device. With auto dim, with garage opener. This system features a Homelink universal transmitter fitted to the underside of the rear view mirror. Applicable only for vehicles equipped with electrochromic rear view mirror. HomeLink is a registered trademark of Gentex Corporation.