The universal transmitter has a white LED and operates on 433 MHz. It can replace all 433 MHz transmitters : TX4UNI, 94330E, 94333E, 94335E, 94334E as well as 4330E, 4333E, 4335E. The matt black color provides a very elegant accessory that one is proud to carry on the key chain. The sliding cover prevents the consumer from unintended operation. To train the new transmitter, the well known simple way, to press the learn button on the operator, remains the same as with all LiftMaster transmitters. The 4-channel transmitter allows you to monitor and to close up to four garage.