... ,all people need wind .but the air condition fees is so expensive ,not all home can use .so our ... company detrusion this solar panel .this is a new type fans ,can not need the electric power ... in day ,and when night can use ..but this is also so convenient ,when the power have run off also ... to be so hot ,you should carry it ,and what is more ,it is not so heave ,so easy to carry .solar ...