Kensington TB450A Wireless Trackball Mouse, Bluetooth LE & 2.4GHz Connection, 4 DPI Options, Connect up to 3 Devices (K72174WW), Black-Red

Ergonomic Design - The sculpted ergonomic design and smooth thumb control provides all-day comfort and features a unique 45° tilt that helps improve wrist and forearm alignment Dual Wireless Connectrion - TB450 includes a choice of Bluetooth Low Energy (LE) and 2.4GHz wireless connection (2.4GHz nano receiver included) Long Battery Life - TB450 has long battery life means up to 18 months of use with 2.4GHz and up to 15 months of use with Bluetooth High-Quality Optical Tracking - A high-quality optical sensor accurately tracks the 34mm thumb-operated trackball, giving users smooth cursor control and optimal precision. The TB450 offers easy cursor speed transitions with 4 DPI options: 400, 800, 1200, 1600 128-bit AES Encryption - include government-grade 128-bit AES encryption for enhanced security to deter hackers from monitoring wireless connection and capturing sensitive information