This MDT-2A Linear MegaCode Remote Transmitter is permanently coded at the factory. The remoter sends a unique code when the button is pressed. The remote is programmed by the receiver learning a remote's unique digital code. The receiver will activate only from the memorized remotes.

Linear MDT-2A Info: Activates Two MegaCode Receivers 318MHz, Battery, Visor Clip, Programming Instructions Included, Dimensions: 1.6" W x 4.2" H x 0.8" D