The DTC remote control for garage door openers. This visor-size transmitter operates at 310 MHz frequency and features 8 dip switches for code set programming. Compatible with Linear and Delta 3 system products, including Moore-O-Matic and Delta 3 models (DTD and DT replacement transmitters). Verify compatibility by checking the frequency marking on your current remote or the back of your garage door opener unit—the number of dip switches on your opener should match this remote's 8-switch configuration. Includes visor clip for mounting.