1Applicable: This solar fan is suitable for pet house, chicken house, tree house, dog house, greenhouse, RV, sightseeing car, camping, etc. 2Environmentally Friendly: This solar powered cooling fan set is lightweight and easy to carry, and it is also environmentally friendly. 3USB Port: The 5V solar panel has a USB output, which can be connected to a USB fan or any USB product for charging which is very convenient to use. 4Sun Power: Fans run fast when solar panels are in direct sunlight. When the sun is weak, the fan runs slowly or stops working. The fans only use the solar panels during the day. 5Stand Upright: Please make sure the solar panels stand upright in the sun to generate more power, in this way, the fan can run faster. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.