Portable Fan WAYCOM Mini USB Personal Fan Power Bank - Portable Fan Outdoor Fan Desktop Fan 3 Speeds Handheld Cool Fan(Black) 2-in-1: used as 3 speed Personal Fan, also a power bank for Mobile Phone and other devices 2 Power Modes: It is powered by Li-battery and USB(like 5V adapter, Computer usb jack,power bank,and phone which supports OTG function). Safe and easy to use: Operated with ABS shell, 2mm thickness, solid structure and 3 Shifts, multifunctional IC design to protect you and kids. Energy Saving: With 4W power, extremly energy-efficient and Strong windshield. Can be used about 6.5 hrs when it is at the lowest shift. Must Haves: Potable, must haves for hot summer and outdoor/indoor activities.