CHERRY MW 8C ERGO, Wireless Mouse with Ergonomic Thumb Rest for Right-Handers, Bluetooth or 2.4 GHz RF Connection, Rechargeable, BlackErgonomic wireless mouse for right handers: Ideal for medium to large hands. Metal surface and scroll wheel, rubberised side parts with Voronoi pattern for excellent grip Comfortable thumb rest for fatigue free working: Ensures a comfortable position for the thumb, which is easy on the wrist ideal for long hours of work Choose between Bluetooth or 2. 4 GHz RF: Switch between 2 connection types and move back and forth using the slide switch. This is