11.Suitable for Pet house, Chicken house, Tree house, Dog house, Greenhouse, RV, Touring Car, Camping and etc. 22.Easy portable, Green energy, Environmentally friendly and Recyclable. 33.The solar panel runs the fan under direct sunshine, and works with solar panel only in the daytime. 44.The fan itself has no battery, the outdoor can be powered by solar panels, and the room can be powered by AC. 55.The solar panel can supply power to the fan, and can also charge the mobile phone and other electronic products, and the 5V solar panel can charge the electronic product of the 3.7V battery.