The 400M by Cougar uses an Optical sensor, specifically the ADNS-3090, providing a DPI/CPI range of 400 / 800 / 1200 / 1600 / 2000 / 2400 / 3200 / 4000 DPI. This results in a tracking speed of 60 IPS, and a maximum acceleration of 20G. It uses a USB connection with a 1.8m Braided cable. The 400M is considered to be an ambidextrous mouse. It weighs in at 105g grams with the cable and is approximately 135 x 67 x 40 mm (LxWxH).
400M's ambidextrous design is unique in that it manages to achieve an unparallelled level of comfort both for right and left handed users. It's not that it feels good, it feels better than the vast majority of pro gaming mice on the market.