Ambielly USB Mini Desk Cooler Fan Velocity Personal Fan Electric desktop fans (6.1", Black) Voltange : DC 5V ,could run from USB power bank;Material : Metal Perfect fan for the office, home, dorm, study, library, games room Powered by a 3.9 ft USB cable - compatible with computers, laptops, portable chargers and other devices with USB output Cable Length : 1.2M / 3.93ft;Fan Diameter : 13.7cm / 5.4" Size(Adjustable) : 15585155mm/ 6.1" x 3.3" x 6.1" (L*W*Max.H);Net Weight : 390g. Please confirm the dimension patiently before purchase.