***** **********Best Quality Guranteed. *****Easy to setup and use, Stable and reliable performance, high receive sensitivity*****GOOD WIRELESS RF SIGNAL, it can pass through walls, floors and doors, control receiver from any place within a reliable distance*****It adopts non-directional wireless encoding technology, allowing independent control without mutual interference, can be flexibly configured in quantity and in operating modes*****The relay module provides high signal sensitivity at lower cost and resist interference*****Be applied in industrial control and security fields, such as light, motor, remote controller, wireless security alarm, wireless door alarm, wireless controller, etc