Package Contents: Includes 4 door opener remote transmitters compatible with LM123. Remote control frequency is 433.92 MHz, with 4 independent channels. Made of 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. The 170-foot signal range allows you to open the garage door or gate without leaving your vehicle 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, copying, or interception. Helps protect your property from vulnerabilities associated with fixed code systems and ensures secure access control. Color: As shown Material: Plastic Package Contents: 4 x Remote Control