Review on Stay Cool Anywhere with our Personal Necklace Fan - Rechargeable USB Desk Fans | Ideal for Ball Games, Camping, Traveling & Hiking | Includes 18650 Battery by Daniel Jackson

This is a great device. The battery life depends on the selected speed. Works great on low and produces lots of air on high, but battery doesn't last as long. Holds a charge when not in use and love the USB port. Sturdy as I've been dropped twice with no damage. The downside is that the plastic links for the necklace aren't that good. (That's why it fell twice) The plastic changed shape and wouldn't connect securely. However, when I used it later, it worked again. You can tie the necklace to anchor points and avoid trouble.