Get maximum tracking accuracy from the most responsive optical sensor (PMW3366). Exclusive Logitech G Delta Zero optical sensor technology minimizes mouse acceleration and increases reliable targeting. Switch DPI modes on the fly - choose from five settings from 200 to 12,000 DPI. Customize to your advantage. Five 3.6g weights come with your Proteus Spectrum. Use some or all of them in the positions where you like more weight, or less. This mouse can be tailored to your preferences.