Package Contents: Includes 4 door opener remote transmitters compatible with LM123. Remote control frequency is 433.92 MHz, with 4 independent channels. Made of high-grade materials with low power consumption technology, durable and reliable for everyday use. Compatible Models: Designed to work with Aleko, Lockmaster, Casar, and Topns automatic door openers. Tested over 100,000 cycles for long-lasting durability and strong signal performance. Strong Signal: Synchronizes with the 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 the receiver buttons. Provides a 170-foot signal range with strong signal penetration for reliable performance in different environments. Enhanced Security: Utilizes advanced 433.92 MHz rolling code technology that generates a unique signal with each use, helping prevent unauthorized access, signal theft, or cloning. Helps protect property by avoiding vulnerabilities associated with fixed code systems. Color: As shown Material: Plastic Package Contents: 4 x Remote Control Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.