Package Contents: 4 door opener remote transmitters compatible with LM123, remote control frequency 433.92MHz, 4 channels; made with high-grade materials and low power consumption technology, fully meeting your needs. Compatible with Topns automatic door openers and various automatic door opener models. Tested over 100,000 cycles for strong signal strength and long-lasting durability. Strong signal performance synchronizes with receiver within one minute, suitable for garages, gates, workshops, and other applications; 170-foot signal range allows operation without leaving the car. Easy to program by pairing through buttons on the receiver. Offers reliable operation in various environments with strong signal penetration. Advanced 433.92MHz rolling code technology generates a unique signal each time, 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 variation between image and actual item. Measurement error allowed within +/- 1-3 cm.