"Waterproof Cooling Fan" means a hot day so as to take cold wind fan utensils, electric drive is a device to generate airflow, fan energize within the configuration later to rotate into the wind to achieve natural shade effect. "Waterproof Cooling Fan" The main components are: AC motor. Its working principle is: energized coil in a magnetic field by the force of the rotation. Form of energy is transformed: the main electrical energy into mechanical energy, and because the coil has a resistance, so that there is an inevitable part of the electrical energy to be converted into heat. "Waterproof Cooling Fan" at work (assuming no heat transfer with the outside room) not only did not reduce the indoor temperature, it will rise.