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 technology, durable and fully meets your needs. Compatible Models: Compatible with Aleko, Lockmaster, Casar, and Topns automatic door openers, including ALEKO models. Tested for over 100,000 cycles, offering strong signal strength and long-lasting durability. Strong Signal: Can synchronize with the receiver within one minute, suitable for various doors such as garage doors, gates, and workshop doors. 170-foot signal range allows convenient operation without exiting your vehicle. 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. Enhanced Security: Advanced 433.92 MHz rolling code technology generates a unique signal with each use, preventing unauthorized copying or interception. Protects against vulnerabilities associated with fixed codes and ensures secure access control. Color: As Shown Material: Plastic Package Contents: 4 x Remote Control