About This ENERGY EFFICIENCY: The fan is solar powered and it can 't storage power, please simply expose it to the full sun, ensure there is no shadow and press the On/Off switch,it will surprise you and save energy AUTOMATIC CONTROL: The speed of the fan is greatly affected by sunlight.When the sun shines directly on the solar panel, the fan can near 3000 RPM.When the sunlight is weak, the fan will work slowly or even stop working.There is no built-in battery in the solar fan,Only work during the daytime WATERPROOF PERFORMANCE: The fan motor part (PCB board/wiring/bearings) has been coated to prevent short circuit or damage caused by rain SUPERIOR PERFORMANCE: The solar panel fan kit pushes hot air out, effectively reducing the room temperature and keeping the air. And our exhaust fan is special solar and working with long service life and energy saving WIDE APPLICATION: Solar panel fan kit is suitable for kitchens, greenhouses, pet houses, chicken coops, barns, cowsheds and more; The fan system can be installed in most places where it is inconvenient to connect to household electricity; Apply them to the area for cooling and exhaustion Overview Brand : Natudeco Color : Black Electric fan design : Exhaust Fan Power Source : Solar Powered Style : Modern Product Dimensions : 0.75"D x 4.7"W x 4.7"H Room Type : Office Special Feature : Waterproof Recommended Uses For Product : Exhausting, Ventilating Mounting Type : Window Mount