DUAL POWER SUPPLY--powered by USB charging and 2200mAh rechargeable lithium battery, longer running time. Outdoors, the USB battery powered fan can last between 2-8 hours under fully charged condition (depending on speed) ;USB fan also powered by laptop, computer, PC, mac, power bank, providing more convenience 3-MODE ADJUSTABLE SPEED--One button can control 3 wind speeds, Press switch once for minimum wind speed, press twice for medium speed, press three times continuously for maximum wind speed; Suitable for office, home, dorm, office, stroller , wheelchair, travel, headboard of a car or bed, etc. Bring cool feeling in summer SUPER QUIET & 360 DEGREE ROTATION--Use powerful brushless motor for this mini usb fan, max speed 4000RPM, low noise up to at 30-36 dB, Quiet when working, don't worry about noise disturbing sleeping babies; 360 up and down rotation, left and right adjustment, enjoying cool wind in all directions USB DESKTOP FAN WITH CLIP--new version, strong and stable base with clip for panels up to 5 cm, such as desk, headboard and stroller handle or just placed on the desk; Equipped with 4 rubber pads under the base, which would not damage furniture or slip SAFE, LIGHTWEIGHT AND EASY CLEANING--Safe ABS net cover, the grid is small enough, blade of flexible fan, don't worry about hurting your baby's finger by accident; small and light mini USB fan is ready to use, space-saving; the front grill can be disassembled for cleaning. A box for storage when not in use.