R.A.T. 2+

Pixart PMW 3325 True 5000 CPI Gaming Optical Sensor
OMRON Long-Life switches in L & R buttons (5M Click)
4 DPI levels – 800/1600/3200/5000 switch on-the-fly
3 Programmable buttons
Low Friction PTFE glide feet.
USB poll rate from 125Hz up to 1000Hz
1.8 Metre braided USB cable
1 big RGB illumination zone