Package Contents: Includes 4 door opener remote transmitters compatible with LM123. Remote control frequency is 433.92 MHz with 4 independent channels. Made from high-grade materials with low power consumption technology, ensuring durability and reliable performance. Compatible Models: Designed for use with Aleko, Lockmaster, Casar, and Topns automatic door openers, including ALEKO models. Tested over 100,000 cycles for long-lasting durability and strong signal strength. 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 buttons on the receiver. Provides 170 feet of signal range with strong signal penetration for reliable performance in diverse environments. Enhanced Security: Utilizes advanced 433.92 MHz rolling code technology that generates a unique signal with each use, helping prevent unauthorized access by eliminating risks associated with fixed codes. 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.