[Cool Down & Ventilation]The Solar Panel Fan can push the heat air out and push the cool air in,which effectively reduces the indoor temperature and keeps the air . Max rotational speed 3000 r/min and 200 CFM which is an solution for the exhaust of small chicken houses, greenhouses, sheds, pet rooms, and windows in hot summer. [Easy to Use]The cooling fan is powered by the solar panel, and easy to install, just connect the interface of the solar panel and the fan, then put it under the to use. The solar panel runs the fan fast under direct sunshine and the solar fan will working more slow or stops working when the sunshine is weak. [Safety Protection & DIY Air Circulation System]The fan is equipped with a double metal protection net to prevent hands and small animals from being injured and to protect the normal operation of the fan blades. You can purchase 1 or more according to your needs, connect it in the middle or both ends of greenhouse or install it in the wall, DIY your own air circulation system. [Waterproof & Long Service Life]The solar panel has been coated to prevent rain from causing short circuit or damage which is suitable for outdoor environment use. (The solar panel is waterproof, be careful not to water on the USB interface) There is no built-in battery in the solar fan, only work when the shines. Specifications: Voltage: DC 18V & USB 5V Solar Panel Power: 10W Max RPM: 3000 r/min CMF: 200 CFM Solar Panel Size: 8.46 X 7.28inch(21.5 X 18.5cm) Fan Size: 4.72 X 4.72 X 0.79inch(12 X 12 X 2cm) Material: plastic + metal Color as shown Package Contents: 1 x solar panels 1 x 1 x DC extension cord Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.