Happy-top&reg; 3 Speeds Portable Mini USB Desktop Fan Rechargeable Emergency Power Bank Ultra-thin Summer Fan Handheld Pocket Fan Electric Personal Fans for Home and Travel (Black) With a mirror in the center of the fan, can use to make up while breath the fresh air. With USB interface, can be used as a power bank to charge your divices for emergency use Adjustable 3 speeds: The portable fan speed can be adjusted among low, medium, high according to your demands. While it keeps low noise level even at the highest speed The rechargeable fan adopts Li-ion 18650 battery (included); through USB conncection it can be powered and charged by your computer/laptop, and other 5V-output USB chargers. But it can not working without battery High energy efficiency: when the battery is charged full, the fan can generally be used 10 hours at the lowest speed, 2 hours at the highest speed Powered by battery or by 18650 battrey (included) or USB: ideal for travelling, jogging or sun bathing etc