Dual or multi-control switches are generally used in some buildings and large houses. For example, the first floor and the second floor are installed with a joint control switch. On the first floor, press it to turn on the lights,then go to the second floor, press the switch to turn off the lights. So you don’t have to  go to the first floor and turn off the lights.The application of the multi-control switch make people to control the switch easier. 

But the multi-control switch also has the following defects:

1.Multiple switches increase costs.

2.Installation lines increase complexity and workload.

3.Connection Wires has technical requirements. 

Now we only need a smart switch to meet all the applications of multi-control switches and avoid defects as following detail. 

Smart switches, in addition to be controlled by button or touch like ordinary switches, we can also control by mobile phones. Such as, if you press the switch on the first floor, you can turn it off with your mobile phone when you reach to the second floor, or you can control the switch directly with your mobile phone, anytime and anywhere.A smart switch can not only achieve the effect, but also simple operation. 

The meaning of designing the smart switch is to suggest you more choices.