This product is a 4 channels universal WiFi wireless smart switch with 433MHz module, for your smart home system to remotely and automatically turn on/off home appliances and electronic devices by phone APP It also can be controlled by remote controller indoors. It can connect and control four appliances on APP at the same time, and you can independently turn on/off each of the four gangs It also supports timing turning on/off the appliances at a specified time, and share to others so that you can control your smart home together with your family You can also voice control your home appliances by , and for Home/Nest,IFTTT, and enjoy intelligent life and make your home smarter Hign-concerned Chemical:None Model Number:Smart WiFi relay Switch Name:4CH Wireless Smart switch Input voltage 2:DC 7V-32V, USB 5V Operating Humidity:40% ~ 80% RH working temperature:-20 degrees to +70 degrees 3 control methods:APP, 433MHz Remote, voice control (The product appearance and printed words depending on the batch, but this does not affect use) Color: As Shown Material: PCB Package Contents: 1 * Smart WiFi relay Switch 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.