Do you always sweat like a pig when you go outside during the summer time? Do you often worry about the hot weather when you do not have power at home? Do you want to take a fan with you when you are outdoor? The super wind rechargeable 3.7V battery fan helps you solve all the problems. It is the best choice for summer. It is compact and functional with a rechargeable battery of long duration and strong wind which applies to all occasions in hot summer. Small and exquisite, makes it convenient to carry, no matter indoor or outdoor. The 3.7V rechargeable Li-ion provides strong power that makes you cool down at the whole summer. DC 5V charging port is very convenient! Standby time can be up to 1.5 hours. Purchase immediately, enjoy the totally cool and comfortable summer! Model: HH-U519 Quantity: 1 Material: ABS Color: Black Interface: DC 5V power port Power Supply: 3.7V/800mA li-ion battery (included) Charged by USB port; mini style and portable Charging time: 8 hours Working time: 1.5 hours Can be used for shopping, camping, football, concert, morning run, climbing etc.