Package Contents: includes 4 door opener remote transmitters compatible with LM123, Remote control frequency is 433.92MHZ, with 4 independent channels High grade 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 equipment testing, it has super strong signal strength and long lasting durability. Strong signal: It can be synchronized with the receiver within one minute, 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: to quickly pair with the system through the buttons on the receiver Enjoy 170 feet of signal range and strong signal penetration to ensure reliable operation in any environment Strong Security: advanced 433.92MHz rolling code technology generates a different signal for each use, preventing the signal from being stolen or copied Protecting your property from traditional fixed code vulnerabilities and ensuring the security of user access control systems. Colour:As Shown Material:plastic Package Contents: 4 x Remote Control Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.