Package Contents: Includes 4 door opener remote transmitters compatible with LM123. Remote control frequency is 433.92 MHz, with 4 channels. Made from high-grade materials with low power consumption technology, fully meeting your needs. Compatible Models: Compatible with 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 such as garages, gates, and workshops. Offers a 170-foot signal range, allowing you to open your garage door or gate without leaving your car for added convenience. 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: Advanced 433.92 MHz rolling code technology generates a unique signal for each use, preventing unauthorized access by copying or interception. Protects against traditional fixed-code vulnerabilities and enhances security for access control systems. Color: As shown Material: Plastic Package Contents: 4 x Remote Control 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.