Kensington Orbit Wireless Trackball with Scroll Ring, Black & Red, K70992JP

128-bit AES Encrypted Wireless Connection: 128-bit AES encrypted communication via 2.4GHz or Bluetooth (3.0 or LE) wireless connection. 40mm Mid-Size Ball Control: Equipped with a scroll ring that helps you smoothly scroll up and down websites and Word documents. The 40mm ball diameter allows for precise tracking and cursor control. 4 DPI Settings: Easily adjust the DPI to 400, 800, 1200, or 1600 to suit your needs. Lower DPI is for precise editing, while higher DPI is ideal for Word and web browsing. Symmetrical Design: The symmetrical design is suitable for both right- and left-handed users. Minimizing arm and hand movement prevents repetitive motions typical of mouse use, providing a comfortable experience. Customizable with KensingtonWorks: Download the free KensingtonWorks software to assign functions (including shortcuts) to buttons and customize cursor and scrolling speed.