High-precision optical sensor 2-stage switchable resolution (1000/2000 dpi) Multi-device function for up to three devices Perfect ergonomics for small and large hands 7 buttons and scroll wheel Comfortable hand feel High-precision optical sensor 2-stage switchable resolution (1000/2000 dpi) Multi-device function for up to three devices Perfect ergonomics for small and large hands 7 buttons and scroll wheel Rubberized side panels for optimal grip