Package Contents: Includes 4 door opener remote transmitters compatible with LM123. Remote control frequency is 433.92 MHz, with 4 independent channels. High-grade materials and low power technology ensure durability and reliable performance. Compatible Models: Compatible with Aleko, Lockmaster, Casar, Topns, and ALEKO automatic door openers. Tested over 100,000 cycles for long-lasting durability and strong signal strength. Strong Signal: Synchronizes with receiver within one minute. Suitable for various doors including garages, gates, and workshops. 170-foot signal range allows operation without leaving your vehicle. 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 any environment. Enhanced Security: Advanced 433.92 MHz rolling code technology generates a unique signal for each use, preventing unauthorized access and protecting against code grabbing or duplication. Helps secure property and 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 in color. Measurement error allowance is +/- 1-3 cm.