Kensington Trackball Pro Fit Ergo TB550

Trackball with ergonomic design and unique 45° tilt for relieving wrist and forearm; High-quality optical sensor ensures smooth cursor control, optimal precision, and 4 switchable cursor speeds (400, 800, 1200, and 1600 dpi); Integrated trackball eject button for effortless cleaning; Features 128-bit AES government-grade encryption for increased security to deter hackers; Dual Wireless: Connect via Bluetooth Low Energy or 2.4 GHz USB-A nano receiver; Rechargeable battery provides up to 4 months of use on a single charge.