Ambielly USB Mini Desk Cooler Fan Velocity Personal Fan (Purple, 7.87'') 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) : 200100200mm/ 7.87" x 3.93" x 7.87" (L*W*H); Net Weight : 500g. Please confirm the dimension patiently before purchase.