This product with a USB power line.* crystal transparent， streamlined design， noble.Unit size: 188*188*10mm fan fan， fan speed: 3200 rpmUsing high heat resistance and heat dissipation function made of acrylic materialA huge fan， you alone in feeling cool， very cool， popular children's favorite.By the size of the radiator (CM):280*270MM* four transparent round feet， can be suitable for 12-15 and below the use of books ".This cooling pad provides round rubber pad high friction coefficient in the four， in order to ensure the stability， not easy to slide placed notebookBig fan is the most popular style this summer， the fan is big， the wind is strong， and there is no noise， summer brings you a bit of cool.