1) Size: 30.5x26x2.5 cm 2) Material: Plastics 3) Packing: Gift box (English) 4) Port: USB 5) Fun: Oil impregnated bearing 6) Fun speed: 1800-3500 7) Noise: 25 db 8) Colour: transparent 9) Convenient reliable and comfortable to carry 10) No need for any installation 11) Compatible with any notebook computers