APP Control: You can use "Ewelink" APP in your smart phone to control the boiler switch wireless with Wi-Fi or 4G network, no hub required, you could turn on your water heater in advance, then enjoy a hot shower when arrived.     Timer and Schedule Function: Take full control of water, you could plan the exact time to turn water heater appliances on/off automatically.     All Families Members Could Control: This smart boiler switch can have several control sites shared by different family members. One mobile phone can control many switches also.     Remote Control: Instantly turn on/off your appliance with your smart phone. The free app allows you to add as many smart switches as you'd like to keep track of multiple appliances.     Wide Compatibility: The switch can be compatible with both iOS ans Android Mobile System, works with Amazon Alexa/Echo, Google Home.     Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on     Type: Boiler Switch     Power Supply: 90V-250V AC     Max Current: 20A/gang     Wireless: 802.11 b/g/n 2.4G     Security: WPA-PSK/WPA2-PSK     Switch Panel Height: 0.9cm/0.4 inch     Colour:black/White     Material:ABS          Package Contents:     1 x Boiler Switch     5 x Screws     1 x English manual          Only the above package content, other products are not included.     Note: Light shooting 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.