The powerful and highly precise sensor, with 4,200 FPS and 48 IPS, gives you the accuracy that matters, even with the fastest movements. With a polling rate of 500 Hz and a response time of 2ms, you'll always be one step ahead of your enemies. With an extra-large scroll wheel and extra buttons, our GS200 is ready for any adventure.... The DPI buttons let you switch from 400 to 4,200 dpi.