Kensington TB550 Wireless Trackball Mouse, Rechargeable Battery, Bluetooth(LE) & 2.4GHz Wireless Connections, Ergonomic Design, 4D Scroll Wheel, 128-bit AES Encryption, White-Silver (K72180WWVN)

Wireless trackball mouse provides dual wireless connectivity with the flexibility of Bluetooth LE, or 2.4 GHz wireless with 128-bit AES government-grade encryption security 4D scroll wheel supports both vertical and horizontal scrolling; Four DPI settings let you easily adjust the cursor speed to fit your needs by selecting the appropriate level (400, 800, 1,200, or 1,600) - lower DPI for precision editing, and higher DPI for word processing or casual browsing Rechargeable battery provides up to 4 months of battery life with a single charge via the USB-C port 34mm ball’s hard surface is specially designed as a perfect sphere for precise tracking and control by the optical sensor; patented ball ejection system features a unique, easy-to-clean design with built-in trackball ejection button to effortlessly remove the trackball for cleaning when needed Ergonomic trackball mouse provides all-day comfort and features a unique 45° tilt that helps improve wrist and forearm alignment