Air CirculatorThis personal fan is equipped with a constructed turbo design to maximize air movement, offering the power for intense air movement, so air cooling circulation can reach all of your living area, and creates pleasant quarters. 4-Speed AdjustableWith adjustable speed settings for personalized comfort, this desk fan will keep you comfortable and cool this summer! Using an upgraded motor, this desk fan provides you with a comfortable working and resting environment. Rechargeable BatteryBuilt-in real 4000mAh battery, this USB fan can be easily charged by outlet/laptop/mobile power/ or any other device with USB port. This fan can run continuously for 11 hours, so you don't have to worry about power problems when you go out! Ultra Quiet FanIf you are looking for a desk fan to enjoy cool but quiet sleep, this is a fantastic choice, this bedroom fan moves air more efficiently and reduces noise down to 28dB, perfect for a comfortable sleep without loud fan noises. Multiple USB Cord Powered CompatibilityWith 4ft USB cable, this USB fan can be powered by PC/laptop, power bank, AC adapter, car charger and other USB-enabled power supply. Plug & Play! You can stay cool all day long.