Mziart Desk Personal Fan Mini USB Table Portable Fan, Metal Design, Quietness, USB Powered with ON/OFF Switch (Black, 6&rdquo;) Ultra-quiet design: a triangle base with rubber sleeves makes the fan more stable and quiet. 4 aluminum alloy blades provide more wind volumes than most 3 blades. 360up and down adjustable direction makes the fan more flexible to meet your needs. 4 Inches blade and 6 inches portable frame save your desk space. It is pwered by a 4 ft USB cable,compatible with computers,laptops,power bank and other devices with USB output.