ME901 WiFi Gas boiler heating thermostat has both RF wireless and WiFi function. The whole set contains a thermostat body, a receiver and a plug. When buyer get the thermostat, they should install the receiver with their gas boiler. The thermostat body could be taken to any room you prefer. And when buyer is not home, he/she could use phone to control the thermostat. ME901 gas boiler heating thermostat is very convenient.