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.