This stove fan is powered by transforming heat into energy, without using any battery or electricity. Start automatically when the temperature of the stove surface reaches around 50. Ideal for those living off the grid or looking to increase the efficiency of their stove and use less fuel. Whisper quiet and completely assembled, makes a great housewarming gift. Specifications: Color: black Size: about 7.1*3*8.4 inch Base size: about 92*75.8mm Net weight: about 615g Material:metal Blade quantity: 4 Air volume: 203CFM Working temperature: 50-380 Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1* stove fan Specifications: Color: black Size: about 7.1*3*8.4 inch Base size: about 92*75.8mm Net weight: about 615g Material:metal Blade quantity: 4 Air volume: 203CFM Working temperature: 50-380 Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1* stove fan