LiftMaster TX4UNIF / TX4UNIS / TX4UNI Universal. A photo of the original remote is very helpful. Press and release the yellow round button on the opener. The learn indicator light will glow steadily for 30 seconds.
eBay
84330E, 94334CE, 94333E, 94334E, 94335E, 9747E,1A5639-7, 1A5477. All remotes Liftmaster remotes starting with "9443", including 94330E, 94333E, 94335E, 94330EWK, 1A5639-7 All Motorlift remotes starting with "8433" and ending in "EML", including 84335EML, 84330EML, 84333EML.
eBay
TX4UNIF 433MHZ GARAGE DOOR REMOTE. Chamberlain Liftmaster TX4UNIF 4 Channel Universal Transmitter 433MHz. The TX4UNIF universal transmitter has a white LED indicator and operates on the 433MHz frequency.
eBay
Operates on 433 MHz frequency using rolling / hopping code security. White LED light indicates frequency.
eBay
Essentially you need to put your receiver (in the garage) into 'learn' mode, and then press one of the buttons on this new remote. The receiver will then have recognised that button on the new remote.
eBay
Compatible with MotorLift ML500, ML700, ML750, ML850 Garage Door Opener and LiftMaster LM600, LM800, LM1000, LM5580 Gate Opener. For Chamberlain Liftmaster Motorlift Remote Beginning with "8433" and "9433".
eBay
The TX4UNIF is part of the latest 433 MHz range from LiftMaster. Stylish and sturdy, the TX4UNIF has a car-key inspired design with a white LED indicator. This transmitter can replace all previous Chamberlain / LiftMaster 433 MHz transmitters – including all 9xxxE, 8xxxE and 4xxxE series remotes.
eBay
LIFTMASTER CHAMBERLAIN GARAGE DOOR REMOTE TX4UNIS 433 Mhz. TX4UNIS 433MHz. Frequency:433.92MHz. C940 433.92MHz. C943 433.92MHz. C945 433.92MHz. CM128 433.92MHz. CM842 433.92MHz.
eBay