Mouse Various colors available 3-button design Ps/2, usb and ps/2 + usb combo ports available Optical tracking Ergonomic design for left and right hand users Key switch life: 10, 000, 000 times Supporting windows 95/98/2000/nt Ball mouse available Color box packing, 100pcs in one carton.Carton size:530*370*645mm.Gross weight:19kgs