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, durable and fully meets your needs. Compatible Models: Compatible with Aleko, Lockmaster, Casar, and Topns automatic door openers. Tested over 100,000 cycles, ensuring strong signal strength and long-lasting durability. Strong Signal: Can synchronize with the receiver within one minute. Suitable for various doors including garages, gates, and workshops. Offers a 170-foot signal range, allowing you to open doors without leaving your vehicle. Easy to Program: Quickly pair with the system using buttons on the receiver. Enjoy a 170-foot signal range and strong signal penetration for reliable operation in any environment. Strong Security: Features advanced 433.92 MHz rolling code technology that generates a unique signal for each use, preventing unauthorized access or signal duplication. Enhances security by protecting against vulnerabilities associated with fixed codes. Color: As shown Material: Plastic Package Contents: 4 x Remote Control Only the above package content is included; other products are not included. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.