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 | Patented Cleaning System - The unique, easy-to-clean design features a built-in trackball ejection button to effortlessly remove the trackball for cleaning when needed | Plug & Play Installation - Users will be up and running quickly thanks to Plug & Play Installation for simple setup. The TB450 can be personalized with free KensingtonWorks software to enhance productivity | Adopts GRS-certified 70% Recycled ABS. 50% Of Overall Plastic Is Recycled Plastic - Kensington is committed to help reduce the impact of plastic on the global environment