Outdoor photo voltaic panels can efficiently convert sunlight into electrical energy. Clean energy, lengthy provider life and energy saving. Keeping the air clean helps to eliminate the fragrance of pets, tobacco, etc. Maintain a cushty temperature level throughout the journey. Suitable for greenhouse, doggy house, tree dwelling and RV etc. Precautions 1. Please don't scratch the surface of the solar panel with sharp objects. 2. When charging the charger with solar energy, please role the photo voltaic panel facing up in direct sunlight hours to assure the best charging effect. 3. Please do not put the charger in outdoors solar energy for emergency charging in wet days, in an effort to now not set off quick circuit. (The entrance of the solar panel isn't fearful of rain (note that no water enters the USB and DC ports.) Power: 20W Fan size: 6x6 in (approx.) Material:ABS monocrystalline silicon colour:black Package Contents: 1 x Exhaust Fan 1 x Solar Panel Only the above package content, different products usually are not included. Note: Light shooting and diverse exhibits can cause the color of the article within the photograph just a little diverse from the real thing. The size allowed error is +/- 1-3cm.