Kensington Pro Fit Ergo Vertical Wireless Trackball - Optical - Wireless - Bluetooth/Radio Frequency - 2.40 GHz - USB Type A - 1500 dpi - Scroll Wheel - 10 Button(s) - Right-handed

KensingtonWorks software customises buttons, cursor and scrolling speeds Three DPI settings: 400DPI, 400-800DPI and 800-1500DPI 34mm thumb-operated trackball with optical tracking for smooth and accurate cursor control 2.4GHz wireless connection - USB receiver stores inside trackball when not in use Two Bluetooth wireless connections Ergonomic design with 60 deg. tilt and natural handshake position to maximise comfort