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 types of doors including garages, gates, and workshops. 170-foot signal range allows operation without leaving your vehicle, providing 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: Features advanced 433.92 MHz rolling code technology that generates a unique signal with each use, preventing unauthorized access, copying, or interception. Enhances security by eliminating risks associated with fixed code systems. Color: As shown Material: Plastic Package Contents: 4 x Remote Control