[Two Input Ports]You could choose USB 5V port or the AC 85-250V screw terminal port to supply power in the input to make the pcb board board work. [Dry Contact/Passive Output]No matter the power source you supply in the input, the output don't have any voltage [Timering]The connectted home appliances can be automatically turned on/off according to the time schedule. [Make Your Home Smarter]it can be used for most of home appliances and lights. Communication method:Wi-Fi Model Number:Tuya Smart Switch Module Compatibility:All Compatible Colour:As Shown Material:ABS Package Contents: 1 x wifi access control relay Module 1 x Shell 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.