1) Size: 31.5x24.5x1.5 cm 2) Material: Plastics 3) Packing: Gift box (English) 4) Port: USB 5) Fun: Oil impregnated bearing 6) Fun speed: 1800-2500 7) Noise: 23 db 8) Colour: transparent 9) Convenient reliable and comfortable to carry 10) No need for any installation 11) Compatible with any notebook computers