Package Contents: Includes 4 door opener remote transmitters compatible with LM123. The remote control frequency is 433.92 MHz with 4 independent channels. High-quality materials and low-power technology, durable and fully meet your needs. Compatible Models: Compatible with for Aleko, for Lockmaster, for Casar and for Topns automatic door openers, compatible with for ALEKO automatic door openers; After more than 100,000 cycles of device testing, it has a super strong signal strength and a long service life. Strong Signal: It can be synchronized with the receiver within one minute and is suitable for a variety of different doors such as garages, gates, workshops, etc.; The 170-foot signal range allows you to open the garage door or gate without getting out of the car, which is more convenient. Easy to Program: For quick pairing with the system via the buttons on the receiver; Enjoy a 170ft signal range and strong signal penetration to ensure reliable operation in any environment Strong Security: Advanced 433.92MHz rolling code technology produces a different signal each time it is used, preventing the signal from being stolen or copied. Protect your property from traditional fixed code vulnerabilities and ensure the security of user access control systems. Color: As shown Material: Plastic Package Contents: 4 * Remote Control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.