eMylo DC 12V 2CH RF Relay Smart Wireless Remote Control Light Switch Garage Door Remote Opener 433Mhz Transmitter with Relay Receiver The product adopts RF technology, with long remote control distance and stable signal. The integrated module features stable performance, making the product easy to use,strongly reliable and enduring. It adopts non-directional wireless encoding technology, allowing independent control without mutual interference. The programmable transmitter and receivers can be flexibly configured in quantity and in operating modes. It is widely used in industrial control and security fields, such as light, motor, remote controller, wireless security alarm, wireless door alarm, wireless controller, etc.