Environmentally Friendly -- Powered by heat, no batteries or electricity required. Taking full advantage of the heat from the stove, the fireplace fan is designed to spread heat throughout the room. Circulate heat reasonably, no need to move to the fireplace, no longer bothered by the cold! Automatic & Quiet Operation -- When the fireplace temperature reaches 40°C, the fan automatically starts rotating. 80-345°C is the normal working temperature. The higher the temperature, the faster the fan rotates and the heat spreading ability is stronger! Note that the whole process is quiet (less than 25dB), even if you rest next to it, without any influence! High Efficiency -- A large-area sawtooth-shaped heat sink can dissipate heat more efficiently. When the temperature reaches about 40°C, the blades rotate, the heat diffuses directly to the environment without having to move up and down. Brings warmth to every corner of the room faster and more efficiently! Ergonomic Design -- The hard