Rechargeable 4000mAh BatteryHand fan built-in 4000mAh battery, TYPE-C charging port only 3 hours fully charged can be used continuously for up to 16 hours, speed 1: gentle breeze 16 hours, speed 2: gentle breeze 10h, speed 3: strong wind 4h.Powerful and coolportable fan design 4 turbo wide fan blades plus innovative inflow wind cover, can cool faster and larger area of the cut air, like natural wind gently, compared to other handheld fans, innovative fan blade to improve wind power by 90%, the fastest motor speed is up to 4400RPM.Lightweight and Convenient Handheld fan size Mini, light weight (3.35 x 1.59 x 6.46 in, 175g ), light in your hands, put the desktop stable, easy to carry in your pocket, lanyard hole design, your more choices. Suitable for travel, commuting, waiting in line, shopping, camping, office, outdoor activities, etc.Upgraded Material Mini handheld fan blade is made of PP material, thin and cutting Wind evenly, the body is made of high-quality ABS plastic material, fine micro-sand feeling, long-term use does not fade. Perfect for summer use. This is a surprise summer gift for boys, girls, men, women and children.