[Working principle]: No battery or supply is required. The thermoelectric wood stove fan converts the heat of the stove into electric energy. There is a thermal module on the fan. The generator set converts heat into kinetic energy to drive the motor. Then the blades rotate and hot circulates, filling the room for warmth. [Space saving]: This fireplace fan is easy to remove and install, and can be fixed on the wood/combustion furnace/fireplace wall pipe to absorb heat, rotate and blow the hot above the fireplace to the living room area. The slope is stable, saving space and preventing children from touching. [Features]: The normal surface temperature is between 50 C and 350 C. The optimum working temperature is 200-300C, the volume is 160-210, the wind speed is 1200rpm, and it does not exceed 350 C (920F). These temperatures can damage the fan and the generator set. [Silent operation]: The fan runs at 35dB, which is very quiet and will not interrupt your reading, work and other activities. You can enjoy warm in a quiet and comfortable environment and improve the circulation of indoor hot . size: 135 x 135 x 160mm Material: Metal colour: Black Package Contents: 1 x wood stove fan 1 x Stove Thermometer 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.