Package Contents: 4 door opener remote transmitters compatible with LM123, remote control frequency 433.92MHz, with 4 independent channels; made with 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, including ALEKO automatic door openers. Tested over 100,000 cycles, offering strong signal strength and long-lasting durability. Strong signal performance synchronizes with receiver within one minute, suitable for various doors such as garages, gates, and workshops; 170-foot signal range allows operation without leaving the vehicle. Easy to program via receiver buttons; provides 170 feet of signal range and strong signal penetration for reliable operation in any environment. Enhanced security with advanced 433.92MHz rolling code technology that generates a unique signal for each use, preventing unauthorized access and protecting against traditional fixed code vulnerabilities. Color: As shown. Material: Plastic. Package Includes: 4 x Remote Control. Note: Light reflection and display differences may cause slight color variation between image and actual item. Measurement allowance: +/- 1-3 cm.