USB wired connectivity System of tracking: optical LED Resolution: 1000 DPI Three buttons, each weighing 75±15g Longevity of button: 3 million keystrokes Rated current/voltage: DC 5v<100mA 85g in weight The measurements are 115 x 65 x 35 ± 2 mm. Platform of operation: Windows XP, Vista, 7, 8, and 10