SPECIAL DESIGN - 3-stage easily adjustable wind speed. The speed of this portable desk battery fan can also be adjusted among low, medium, and high according to your demands. it is decent and quiet which ensure the peaceful flow of air. and enough for personal use. | LARGE CAPACITY - Portable handheld fan operates with 3600mAh Improved battery and can operate for 4.5-10 hours after a full charge. It can also be used via USB port from your PC/computer/USB charger or other USB devices. | HIGH QUALITY - Safe and secure grid to prevent accidental touch injuries, low noise and low power consumption. | CONVENIENCE - Slim, lightweight, delicate, easy to carry,ideal for reading, doing sports, waiting in line and travelling, etc. | COMPATIBLE - Rechargeable battery operated air fan, USB cable can be charged with computer, mobile power, power bank, strong compatibility.