The fan came with a neck string, you can hang the fan on your neck and free your hand. Build-in 18650 lithium rechargeable battery, and can charge by USB. Three gears adjustable wind speed follow soft air supply is suitable for the lunch break to sleep, work and study and shopping trip. Full charging can work for 2-6 hours. Great for climbing, running, camping, hiking, sporting, studying, office, etc. Custom logo is welcome.