ThreeH Rechargeable USB Fan Personal Desktop Mini Fan Rechargable Fan Quiet Operation Fan H-DL001,Blue Charging: Red light to use DC 5V power supply when charging, when battery is fully automatically converted to blue light, it can use while charging. It also can be used to phone charging. International standard 18650 capacity lithium battery provides exceptionally long using time and strong power output. Switching Regulation: Small slide switch open, windy and cooling. Powered by rechargeable battery with a micro USB port, light-weight and handle design, convenient to carry anywhere and anytime. Compact and versatile, this fan is designed for personal space. Angle adjustment: The fan bracket can be come or back to adjust the fan blade with180 angle, it is easy operation. Saving energy efficient, quiet air function.