Package Contents: 4 door opener remote transmitters compatible with LM123, remote control frequency 433.92 MHz, with 4 independent channels; made of high-grade materials and low power technology, durable and fully meet your needs Compatible Models: compatible with Aleko, Lockmaster, Casar, and Topns automatic door openers; compatible with ALEKO automatic door openers; tested over 100,000 cycles, offering strong signal strength and long-lasting durability Strong Signal: synchronizes with receiver within one minute, suitable for various doors such as garages, gates, workshops; 170-foot signal range allows operation without exiting the vehicle for added convenience Easy to Program: quickly pair with system using buttons on the receiver; enjoy 170 feet of signal range and strong signal penetration for reliable operation in any environment Enhanced Security: advanced 433.92 MHz rolling code technology generates a unique signal for each use, preventing unauthorized copying or interception; protects against traditional fixed code vulnerabilities and ensures secure access control Color: As Shown Material: Plastic Package Contents: 4 x Remote Control