USB PoweredAfter fully charged, the hand held fan can last for 2-4 hours. This is also a USB fan compatible with universal USB devices port, you can charge it by power bank, PC/laptop, phone charger etc. Safe and One-Button OperationMade from high quality ABS materials, very safe to use for both kids and adults. It is easy to operate with only one button, press the button to turn on/off the fan, and press repeatedly to adjust the wind speed. 3 Speeds,Small size but PowerfulBuilt-in powerful motor delivers a cool air flow at 3 different speeds, allows you to choose appropriate wind speed as you wish.The working time of Speed 1 : 4 hours, Speed 2: 2.5hours, Speed 3: 2 hours. A perfect partner in such a hot summer to keep you cool when travelling, working or doing sports. Lightweight Portable The portable fan only weighs 0.18lb, designed in suitable length and width that is very easy to hold, you can put it into pocket or bag, its suitable for outdoor, sport, travel with its palm-size. With the removable base, you can use it as desk fan in your office, make up, home or carry it around to solve the hot stuff on the road. Meet your cool needs throughout the day. WHY SHOULD YOU CHOOSE OUR MINI FAN - Built-in rechargeable batteries ensures 2-4 hours of battery life depending on the speed setting. - High Power with 3 ultra-quiet speed settings that provide strong airflow with the lowest of noise decibels. - The lightweight design lets you take it with you wherever you go. - The provided stand allows you to easily prop the personal fan up securely on your desk at the office to keep you cool while working or watching movies. - Multiple functions for home, office, and even outdoor camping.