The device consists of two modules: a control panel with a thermometer and a transmitter and a socket block with a receiver and a switching relay. The control panel runs on two AAA batteries, and the socket block connected to a 220V household network does not require power at all.The socket block includes heating or cooling equipment, with the help of which we will maintain the air temperature in the room. A direct climate - control is already carried out with the help of a thermostat.The remote control LCD displays the current temperature, and we just have to select the mode (heating or cooling), temperature display units (C or F) and set the temperature that we would like to maintain in room.The temperature sensor built into the remote control records the current temperature and if it differs from the set one, the remote control transmitter sends commands to the socket block, which in turn turns on or off the heating or cooling device connected to it.The thermostat is made of high-quality plastic, economical and has a good radio range, there is a slight error in temperature monitoring.In heating mode (when the current temperature should rise to the set value), the thermostat is wrong by 1C, and in cooling mode (when the current temperature should tend to the set one, falling), it deceives by 2 degrees, that is, the fan turns off when the room temperature 2C less than planned. one way or another, you can turn a to these inaccuracies, because the thermostat performs functions, which means that you can completely rely on a smart assistant by setting the room temperature that is acceptable to you . This digital thermostat is suitable for both an apartment and a country house. Boilers, electric radiators, heaters, convectors, electric fireplaces, electric heaters can be connected to the thermostat as heating devices, and fans and air conditioners can be connected as cooling devices.Transmission frequency: 433.92MHzMaximum range: 20 in open areaTolerance: 1C /FRemote Control Power: 2pcs * AAA 1.5V BatteriesColour:WhiteMaterial:plasticVoltage:AC100-240VPlug Type:EU Plug,it applies to Indonesia, , , , and so on Package Contents:1 x Remote control1 x Receiver 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.