R.A.T. 1+

Pixart PAW 3205 True 2000 CPI Gaming Optical Sensor
OMRON Long-Life switches in LR buttons (5M clicks)
4 DPI levels - 800/1000/1600/2000 switch on the fly
60g without USB cable
3 Programmable buttons
USB poll rate from 125 Hz up to 1000 Hz
1.8 Metre braided USB cable

R.A.T. 1+