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. Specifically compatible with ALEKO 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 garage doors, gates, and workshop doors. Offers a 170-foot signal range, allowing you to open doors 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: Features advanced 433.92 MHz rolling code technology that generates a unique signal each time, preventing unauthorized copying or interception. 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 Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm. Due to lighting and screen setting differences, the item's color may vary slightly from the pictures. Slight dimensional differences may occur due to manual measurement.