Come and see our amazing products. 4 Inches and 3 colors for your choice.Compatible with computers, laptops, portable chargers and other devices with usb output. Powered Only by a USB cable. For better performance, 2A USB port is highly recommend. Perfect fan for the office, home,dorm,study,library,games room.The Sturdy metal Fan produces a soft breeze to keep you cool and relaxed.It's a great gift to print your logo, corporate logo and message. Pls confirm with us about the packing info, stock color and exact production time before placing your order.