Come and see our amazing products. Replaceable and Rechargeable battery ( INCLUDED ), 3-6 hours working time depends on different speeds.USB charging by a computer, laptop, power bank, USB Charger, cellphone adapter, car charger, etc.Can be Put or Clip on anywhere you want, great for baby stroller, crib, home and office, library, laptop, gym workout, car backseat, outdoors, camping, trips, and anywhere need cool wind. Pls confirm with us about the packing info, stock color and exact production time before placing your order.