"Mini Air Cooling Fan" rotational force energizing coil in a magnetic field. Form of energy is transformed: the main electrical energy into mechanical energy, and because the coil has a resistance, so there is inevitably a part of electrical energy to be converted into internal energy. When the fan work, due to the current through fan coil wire is resistance, so "Mini Air Cooling Fan" will inevitably produce exothermic heat outward, so the temperature will rise. But why do people feel cool? Because the body's surface has a lot of sweat, when after the "Mini Air Cooling Fan" Working together, the indoor air can flow together, so we can promote the rapid evaporation of sweat, combined with "evaporation needs absorb a lot of heat, "so people will feel cool.