Ambielly USB Mini Desk Cooler Fan Velocity Personal Fan (Blue, 6.1'') Voltange : DC 5V ,could run from USB power bank Product Name : Mini USB Fan Material : Metal Cable Length : 1.2M / 3.93ft;Fan Diameter : 18cm/7.0" Size(Adjustable) : 15585155mm/ 6.1" x 3.3" x 6.1" (L*W*Max.H);Net Weight : 390g.