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 for everyday use Compatible Models: Compatible with Aleko, Lockmaster, Casar, and Topns automatic door openers; Specifically designed to work with ALEKO automatic door opener systems; Tested over 100,000 cycles for long-lasting performance and strong signal strength Strong Signal: Synchronizes with receiver within one minute; Suitable for various door types including garage doors, gates, and workshop doors; Offers a 170-foot signal range for convenient operation without exiting your vehicle Easy to Program: Simple pairing process using buttons on the receiver; Provides 170 feet of reliable signal range with strong penetration for consistent performance in different environments Enhanced Security: Utilizes advanced 433.92MHz rolling code technology that generates a unique signal with each use, helping prevent unauthorized access by eliminating code duplication; Helps protect property by avoiding vulnerabilities associated with fixed code systems Color: As Shown Material: Plastic Package Contents: 4 x Remote Control