1. Three-speed wind speed, you can be adjust it.
2. Multiple colors for you to choose from. 3. [Power supply mode]: Battery storage (18650 lithium battery), USB power supply (pluggable computer USB port). Detachable battery compartment, easily maintain and change batteries by yourselves.
4. Charged by USB interface, can work when charging or when charged. Work independently when fully charged, can be carry for outdoor use.