Kensington Orbit Wireless Trackball with Scroll Ring, Professional Computer Mouse with Bluetooth, (2.4GHz Wireless), Optical Tracking & AES Encryption Security, Left or Right Handed - Black (K70992WW)Kensington Orbit Wireless Trackball Mouse With Scroll Ring: The popular choice of professionals everywhere now wireless with customisable buttons & 4 DPI settings Dual Wireless Connectivity: Offers the flexibility of 2. 4GHz & Bluetooth (3. 0 & LE), with 128 bit AES government grade encryption security for your peace of mind Ambidextrous Design: For right or left handed users, plus the scroll ring lets you spin the dial to move up & down web pages or