1. Remote Control, no distance limitation 2. 4G Data network Remote Control via App and PC web 3. SMS Call Control: All the people who know SMS and password can send SMS text to control the 8 relay outputs.For the call control, it supports 99 authorized call numbers Max. 4. With 8 relay outputs (10A/30VDC, 10A/250VAC) 5. Support Temperature / Humidity Control 6. Scheduled / Timing Control 7. Industrial class design, Aluminum alloy material It can be controlled by two modes, SMS Call mode or 4G Data Network Mode. Application: 8 Channels support to control more devices, you can control all channels at the same time and you can also control each relay separately . It was widely used in farm, hennery, machine room, electric garage door etc. Temperature & Humidity Control function: If the temperature(humidity) is less than (more than ) the tempeareture (humidity ) you set, the device will switch on/off automatically as you required. For example : If you need the device to work automatically when the device less than ( more than ) a certain temperature /humidity , you can use this function. Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC100-240V Colour:As Shown Material:plastic+metal Package Contents: 1 x 8 Channel Relay Switch Kit 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.