Package Contents: 4 door opener remote transmitters compatible with LM123, remote control frequency 433.92 MHz, with 4 independent channels; made of high-grade materials with low power consumption technology, durable and reliable Compatible Models: compatible with Aleko, Lockmaster, Casar, and Topns automatic door openers; also compatible with ALEKO automatic door openers; tested over 100,000 cycles for long-lasting durability and strong signal performance Strong Signal: synchronizes with receiver within one minute; suitable for various doors including garages, gates, and workshops; 170-foot signal range allows operation without exiting the vehicle Easy to Program: quick pairing via receiver buttons; provides 170 feet of signal range with strong signal penetration for reliable performance in diverse environments Enhanced Security: advanced 433.92 MHz rolling code technology generates a unique signal with each use, preventing unauthorized access or signal duplication; protects against vulnerabilities associated with fixed codes Color: As Shown Material: Plastic Package Contents: 4 x Remote Control