Package Contents: 4 door opener remote transmitters compatible with LM123; Remote control frequency is 433.92MHz, with 4 independent channels; Made from high-grade materials with low power consumption technology, durable and reliable Compatible Models: Designed for Aleko, Lockmaster, Casar, and Topns automatic door openers; Compatible with ALEKO automatic door openers; Tested over 100,000 cycles for long-lasting performance and strong signal strength Strong Signal: Synchronizes with receiver within one minute; Suitable for various doors including garages, gates, and workshops; 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 penetration for reliable performance in diverse environments Enhanced Security: Utilizes advanced 433.92MHz rolling code technology that generates a unique signal with each use, preventing unauthorized copying or interception; Helps protect property by avoiding vulnerabilities associated with fixed codes Color: As shown Material: Plastic Package Contents: 4 x Remote Control