Portable: This necklace fan can be used while hanging on the neck, making it completely portable and best of all is completely hands-free! Charging time: The neck fan comes with a built-in 2000mAh rechargeable battery and a USB charging cable. It charges in approximately four hours and provides you with 4-12 ours of use. Exercise: Great for runners to keep your face cool as you work out. Speed: Three speed adjustments which can easily be selected at a press of a button depending how cool you want to be. USB rechargeable fan: Get a neck-mounted USB rechargeable fan. Neck-Mounted Usb Rechargeable Fan | Living Social