FEATURE * 3 buttons * 800dpi * With blue LED light * Very shiney surface * Ergonomic design * PS2, USB and USB/PS2 available * More colors available SYSTEM REQUIREMENT * IBM PC compatible system * Microsoft Windows 9X, NT,Me, 2000, XP * Available PS/2 or USB port. PACKING * Each one in a gift box (blister+ paper card) *40pcs in one carton * Carton size: 425*292*457mm * N.W.: 6.00 KGS (Appr.) * G.W.: 7.50 KGS (Appr.) * 20500pcs/20抍ontainer