Package Contents: Includes 4 door opener remote transmitters compatible with LM123. Remote control frequency is 433.92MHz, with 4 channels. Made of high-grade materials with low power consumption technology, fully meeting your needs. Compatible Models: Compatible with Topns automatic door openers and other compatible models. Tested for 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 types of doors such as garage doors, gates, and workshop doors. 170-foot signal range allows operation from inside the vehicle for added convenience. Easy to Program: Quickly pair with the system using buttons on the receiver. Offers 170 feet of signal range and strong signal penetration for reliable operation in various environments. Strong Security: Features advanced 433.92MHz rolling code technology that generates a unique signal with each use, helping prevent unauthorized access. Helps protect against traditional fixed code vulnerabilities and enhances security for access control systems. Color: As shown Material: Plastic Package Contents: 4 x Remote Control Only the items listed above are included; other items are not included. Note: Lighting reflections and differences in display screens may cause slight variations between the color shown in the image and the actual item. Measurement may vary by +/- 1-3 cm.