LOGITECH | Mx Vertical Graphite Mouse Black | TE0135959Operating System Linux, Windows XP The MX Vertical mouse features an advanced ergonomic design that creates a natural handshake position for your hand. This unique shape has been optimised to improve posture and reduce strain whilst in use. High precision 4000dpi sensor ensures less hand movement to reduce fatigue Instantly adjust dpi speed at the touch of a button; 400 to 4000dpi range Four customisable buttons Versatile connectivity options;