Package Contents: 4 door opener remote transmitters compatible with LM123, remote control frequency 433.92MHz, featuring 4 independent channels; made with high-grade materials and low power technology for durability and reliable performance Compatible Models: compatible with Aleko, Lockmaster, Casar, and Topns automatic door openers; designed to work with ALEKO automatic door opener systems; tested over 100,000 cycles for long-lasting durability and strong signal strength Strong Signal: synchronizes with receiver within one minute; suitable for garages, gates, workshops, and other applications; 170-foot signal range enables convenient operation without exiting the vehicle Easy to Program: simple pairing process using buttons on the receiver; offers 170 feet of signal range with strong signal penetration for reliable performance in various environments Strong Security: equipped with advanced 433.92MHz rolling code technology that generates a unique signal with each use, helping prevent unauthorized access and enhancing security compared to fixed code systems Color: As Shown Material: Plastic Package Contents: 4 x Remote Control