1) Size: 30x16x5.5 cm 2) Material: metal 3) Packing: Gift box (Chinese,English, Japanese) 4) Port: USB 5) Fun: Oil impregnated bearing 6) Fun speed: 1800-3000 7) Noise: 23 db 8) Colour: silver 9) Convenient reliable and comfortable to carry 10) No need for any installation 11) Compatible with any notebook computers