How is this fireplace fan working without batteries or electricity? It seems impossible, but this stove fan runs without batteries, cords or electricity. It works because heat is a form of energy. This stove fan is designed for usage on freestanding stoves with a normal surface temperature of between 50 degree centigrade-350 degree centigrade. Temperatures above this range may damage the fan and the electricity generating units. Features - Color: Black. - Material: Aluminum Alloy. - Size: 19.00X15.00X9.50 cm/ 7.47X5.89X3.73 inch. - Rotate Speed: 1000-1300 r/mim. - : 5. - Operating Temperature Range: 122 °F - 662 °F / 50 degree centigrade - 350 degree centigrade. - Unit: 160-210 FM. - Power: Thermoelectric Generation Module. - Heat Powered Stove Fan: No electricity needed, no external power source needed, less consumption, stove fan. - Save Energy: Efficiently drive warm air throughout the room. Less consumption, more efficiency. - Ultra Quite Operation: Spcecially crafted 5 aluminum , passed test, , safely glows with speeds up to 160-210 FM. - Works , wood, gas or pellet stoves. Warm up your room with this energy-saving stove fan. - System: Powered by thermal transformation. Starts automatically from 122°F to 662°F. Package list: 1 x Fan 1 x Thermometer 1 x Instructions