SPECIFICATIONS: Control: Variable rotary speed control with power off and torch Output Power: 4W Working Time: Approximate 1 to 3 hours (depending on fan speed) Battery: Lithium-ion 18650~3.7V Charging Time: 4-5 hours (5V Input) Red light means charging, Blue light means charging is full Dimension: 110 x 85 x 37 cm Net Weight: 166g Battery and USB Cable included Available in Blue, White, Green and Black Folding and Multipurpose Design: This fan can fold up to 180°. You can use this fan: hold it on your hand, put it on the table. Energy source: This fan is a USB port rechargeable model. It can also be powered directly by batteries, 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. And 4pcs fan blades, strong wind, wind distance up to 3m. Brushless motor makes the fan durable. 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 and any activity.