Long woking time and Portable for Outdoor Use:This hand held fan operated by 500mAh battery(up to 20 hours working time), so you can enjoy the fan whole day during outdoor/inside events .Rechargeable by power adapter,power bank,or computer. It is very convenient for outdoor use.Foldable and Portable:The size of this pocket fan is only 4.8*2.*.4 inch, weight:6.7 Ounce. It can be easily put it in your pocket or purse when you are out to Disney, camping and so on. The foldable design makes it easy to be carried and stored.3 Wind Speeds and Low Noise: This Personal Air Cooler has 3 fan speeds, you could select the perfect wind power as you need.The USB fan is built-in with no frame, the noise is down to 40db.Spray Humidification Design:This cooling fan has a spray humidification hole in the middle, which is not only a cooler but also a humidifier. Use humidification and cool air to create your personal space and bring a cooler experience in the hot summer.NOTE:This personal fan with special soft TPE material, the blades are very safe. If you accidentally touch the rotating blades, the soft blades will automatically stop and keep you safe. But please keep your hair at a distance to avoid getting involved in the fan.