Package Contents: 4 door opener remote transmitters compatible with LM123, operating at 433.92MHz frequency with 4 independent channels; constructed from high-quality materials with low power consumption for durability and reliable performance. Compatible with Aleko, Lockmaster, Casar, and Topns automatic door openers, including ALEKO models. Tested for over 100,000 cycles to ensure long-lasting durability and strong signal transmission. Features a 170-foot operational range, allowing convenient control without leaving your vehicle. Easy to program using receiver buttons; delivers consistent signal penetration for dependable operation in various environments. Utilizes advanced 433.92MHz rolling code technology to generate a unique signal for each use, enhancing security by preventing unauthorized access and overcoming vulnerabilities associated with fixed codes. Suitable for use with garage doors, gates, and workshop doors. Color: As shown. Material: Plastic. Package Includes: 4 x Remote Control. Note: Slight color variations may occur due to lighting and display differences. Measurement allowance: +/- 1-3 cm.