REMAX Battery Operated Fan USB Rechargeable Silent Desk Fan 4.5h 4 Blades Mini Personal Fan with Clip and 2200mAh 18650 Battery REMAX / Yoosion mini battery fan (Two Brand shipped by chance but with same quality): 360 degree adjustable tilt-angle head.Helps you easy to adjust the angle where its needed most. Adopt ultra quiet motor,produces minimal operational noise,won't interfere work and sleep. Build-in rechargeable lithium battery and powered by USB.Can use up to 4.5 hours after full charging. Wireless portable fan,let you cast off wire manacle , can be used in anytime and anywhere, even outdoor use, enjoy a refreshing summer. 3W low power consumption,achieve energy saving & environmental protection.Work Time:The minimum wind speed can last 4.5H.The maximum wind speed can work 1.5H.We advise you bring a power bank, so you can power for the fan anytime and prolong the work time.