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 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 allows synchronization with receiver within one minute, suitable for garages, gates, workshops, and other applications. 170-foot signal range enables convenient operation without exiting the vehicle. Easy to program by pairing through the receiver buttons. Offers strong signal penetration for reliable operation in various environments. Features advanced 433.92 MHz rolling code technology that generates a unique signal for each use, enhancing security by preventing unauthorized copying or interception. Helps protect property by avoiding vulnerabilities associated with fixed code systems. Color: As shown. Material: Plastic. Package includes: 4 x Remote control. Other items not included. Note: Lighting and display differences may cause slight color variations. Measurement error allowance: +/- 1-3 cm.