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 such as garages, gates, and workshops. 170-foot signal range allows operation without leaving your 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 performance in any environment. Strong Security: Advanced 433.92 MHz rolling code technology generates a unique signal with each use, preventing unauthorized copying or interception. Helps protect against traditional fixed-code vulnerabilities and enhances access control security. Color: As shown Material: Plastic Package Contents: 4 x Remote Control Only the items listed above are included; other products are not included. Note: Light reflection and differences in display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.