CestMall 3 Speeds Portable Multi-Functional Mini Rechargeable Fan Powered by 18650 Li-ion Battery (Included) & USB Charging for Outdoor Travel with String White It's mini size,12cm*8.8cm*3.8cm.Can be hung on the neck with string;brings calmness to your agination heart 3 Gears wind power (can adjust the wind speed as you like); Turbofan, strong wind power, long life intelligent control Can work for 2-6 hours when full charging, ABS material(energy conservation and environmental protection), 3.8cm thickness convenient to bring for ourdoor Multi-functional Mini Rechargeable Fan powered by 18650 lithium rechargeable battery (can be recycled), convenient to carry anywhere and anytime USB charging port can be connected with computer or power bank; Good for running, sporting, camping tent, office and study, outdoor hiking