The ways of communication between switch and the fixture without wiring

wireless transmission: A wireless receiver / lighting controller is typically wired or screwed into a fixture or device, wired or otherwise connected to the electrical system of the building or plugged into an outlet. The wireless receiver's memory is programmed by any number of means to respond to certain selected "switches" or (more correctly) remote control transmitters.

How to determine whether the controller is qualified

When selecting a controller, we certainly have to look at the quality of the product, understand the product is qualified, that at this time certainly need to do more to understand and observe the manufacturer to see how the actual quality of this device is qualified, in the course of work whether it can guarantee the most basic building effects and so on. And we should get to know what effect the controller it