Package Contents: 4 door opener remote transmitters compatible with LM123. Remote control frequency: 433.92 MHz, with 4 independent channels. Made from high-grade materials with low power consumption technology for durability and reliable performance. Compatible with Aleko, Lockmaster, Casar, Topns, and ALEKO automatic door openers. Tested for over 100,000 cycles to ensure long-lasting durability and strong signal strength. Strong signal allows quick synchronization with receiver within one minute, ideal for garages, gates, workshops, and other applications. Offers a 170-foot signal range for convenient operation without exiting the vehicle. Easy to program by pairing through the receiver buttons. Provides strong signal penetration for reliable performance 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.