Description: USB Power: This fan is a USB port rechargeable model. It can also be powered directly by batteries, but you must remove the insulation from the battery compartment, otherwise it will not be recharged or used.USB cable can be charged with computer, mobile power, power bank and so on. 3 Adjustable Speed Level:Low/medium/high speed level.Adjust appropriate fan speed by pressing the power button repeatedly. Portable Lightweight Design:When you go outside, you can put it in the bag with you,especially suitable for summer travel or outdoor sports,you can take it to anywhere. Works 2-4 hours on a full charge. Practical User-friendly handgrip design. Specification: Power Supply: USB Rated Voltage: 3-7V Rated Power: 4.5W Noise: ≤ 36dB Speed Adjustment Gear: Three Gross Weight: 123g Charging Input DC5V---1.0A Battery Capacity 1200mAh Life Time: 2-4h Size: 106x210x47mm / 4.17x8.26x1.85inch Material: Plastic Package Includes: 1 Piece Handheld USB Fan(4 Pack) Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!