Kensington TB550 Wireless Trackball Mouse, Rechargeable Battery, Bluetooth(LE) & 2.4GHz 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