Outdoor photo voltaic panels can efficiently convert daylight hours into electric energy. Clean energy, long service existence and energy saving. Keeping the air clean supports to eradicate the heady scent of pets, tobacco, etc. Maintain a comfortable temperature level during the journey. Suitable for greenhouse, puppy house, tree dwelling and RV etc. Precautions 1. Please do not scratch the outside of the solar panel with sharp objects. 2. When charging the charger with photo voltaic energy, please position the photo voltaic panel going through up in direct daylight to guarantee the finest charging effect. 3. Please do not put the charger in exterior solar energy for emergency charging in rainy days, with the intention to now not trigger short circuit. (The entrance of the photo voltaic panel is not scared 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 equipment content, other products should not included. Note: Light capturing and sundry reveals may cause the color of the item within the photo a bit different from the real thing. The measurement allowed error is +/- 1-3cm.