The portable handheld fan is rechargeable and ultra-quiet with a noise level of just 12db. It features 6 adjustable speeds to keep you cool anywhere. With a long-lasting 3600mAh battery, it can work continuously for 2.5-14 hours depending on the speed setting, and it only takes 2 hours to fully charge. This small fan can be held in your hand, placed on a table, or hung around your neck with the provided rope. The fan is foldable, allows one-key air volume adjustment, and has a digital display for gear position and remaining power. It can also be used as a mobile power supply for emergency charging of mobile phones, notebooks, and other devices.