【Lasts Long with Large Capacity Battery】Running on 4400mAh rechargeable batteries(included) which could fully recharged within 3.5 hours! the fully charged batteries can last 6.5 hours even at the highest speed, about 40 hours at the lowest speed. This desk fan can also be used as a (4400mAh)power bank in emergency, extremely suitable for outdoor camping or travel use. 【Stepless Speed Regulation】It means you can set any speed from 0 to maximum and no interval by rotating the switch. Clockwise rotation for strengthening wind and anti-clockwise for weakening. 【Large Opening Strong Clip & 720 Degree Rotating】Clip on Fan and Desk Fan in one, it can be placed on the tabletop or clip into flaky items of thickness within 1.65 inch, with 360 degree horizontal and vertical rotation to adjust the angle flexibly, especially great for baby stroller, home, beds, desk, office and outdoors. 【Convenient Charging】Powered by 2pcs 2200mAh 18650 batteries(included) which are rechargeable by USB cable(included), it compatibles with computers, laptops, power bank and other devices with USB output, the fan is convenient for indoor and outdoor use. 【Compact Fan with Premium Materials】This desk fan is made of premium materials as you see from the picture. So that\'s make it durable and sturdy. This clip fan(5.6*4.3*8.5 inch) is easy to use and carry around also, lightweight and portable design arrow you to carry it everywhere.