Long Battery LifeCompared to other handheld fans in the market, this model is equipped with a larger battery capacity of 4000mAh(twice larger than others), which supports 5-20h working time with one full charge. Battery life depends on different speeds: Speed 1 (20 hours); Speed 2(15 hours); Speed 3(5 hours). Handheld/Desktop This mini portable fan can be used as a handheld fan when outdoor and used as a mini desktop fan on a flat table when in the office. There is an anti-slip mat at the bottom of the base to keep it stable when placed on the table. USB RechargeableMini hand fan is USB rechargeable with only 3 hours to get it fully charged. It supports USB charging by USB charger, car charger, or computer. Easy Cleaning & Mini SizeFeatured with a detachable cover, this mini portable fan is easy to clean easily by counterclockwise to separate the cover and the fan. Besides, It is small in size for convenient carrying in your bag. Perfect for commute/travel/shopping/picnic/office. It would be one of your bag essentials in summer. Warm Tips1. Before use and recharge, please make sure to turn on the Anti-trigger Switch at the bottom of the base. 2. It is designed with only one button control. Short press the button to turn on the fan, and press repeatedly to adjust the wind speed or turn off the fan.