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: designed to work with Aleko, Lockmaster, Casar, and Topns automatic door openers; compatible with ALEKO automatic door openers; tested over 100,000 cycles for strong signal strength and long-lasting durability Strong Signal: synchronizes with receiver within one minute, suitable for various doors including garages, gates, and workshops; provides up to 170 feet signal range for convenient operation without exiting the vehicle Easy to Program: simple pairing process using buttons on the receiver; offers 170 feet signal range with strong signal penetration for reliable performance in diverse environments Strong Security: utilizes advanced 433.92MHz rolling code technology that generates a unique signal with each use, helping prevent unauthorized access by eliminating risks associated with fixed codes; enhances security for access control systems Color: As Shown Material: Plastic Package Contents: 4 x Remote Control