First Look Expert Mouse Pro TB900 EQ the most advanced trackball

For those of us who live in the digital landscape—spending hours managing complex multi-monitor setups, fine-tuning video edits, or wrestling with dense spreadsheets—the standard mouse simply isn’t cutting it. Long-term comfort demands more than just a comfortable grip; it requires input devices engineered for efficiency.

While ergonomic vertical mice have captured much attention recently, the trackball has maintained its legendary status. It offers pure, effortless efficiency that appeals to power users seeking streamlined workflow. And when you look to the heritage of innovation, Kensington stands as royalty in this peripheral space, celebrating four decades of pushing boundaries.

Now, Kensington is ready to unleash its most ambitious peripheral yet: the Kensington Expert Mouse Pro TB900 EQ Trackball. This new model promises to be the definitive desk upgrade for anyone demanding both classic design and modern performance.

We got our hands on an early sample of the device, focusing on the eye-catching red ball variant, to see if this trackball truly lives up to four decades of innovation. The results suggest that Kensington hasn’t just updated a chassis; they’ve completely overhauled the interaction between the user and their computer.

The design maintains the commanding footprint and symmetrical silhouette that made the original Expert Mouse series famous, ensuring that both left-handed and right-handed users share the exact same ergonomic comfort. At the heart of the device is the signature 55mm ball, providing a satisfying focal point on the dark chassis.

While classic experts might miss the traditional snap-on wrist rest, the naturally sloped angle of the body provides surprisingly natural positioning during extended typing and navigation sessions. This focus on form factor is balanced by an array of controls designed for total customization.

The control system offers macro heaven, blending physical inputs with intelligent software functionality. Users benefit from the classic Expert scroll ring, enhanced with software-adjustable responsiveness, along with two side scroll wheels for effortless horizontal movement. More impressively, the device supports up to 16 sets of programmable controls via software layering in KensingtonWorks. This means complex workflow macros and multi-display shortcuts can be mapped precisely without relying on physical mechanical tension dials.

Performance is where the TB900 EQ truly shines. It eliminates the lag that often plagues trackballs, boasting a high-speed 1kHz polling rate. Coupled with Kensington’s DIAMONDEYE Optical Tracking with Dual Sensors, cursor movement is razor-sharp and smooth across high-refresh-rate displays, ensuring that flickering or jitter is a thing of the past.

Flexibility meets convenience with robust connectivity. The device offers seamless multi-device support through four channels: 2.4GHz wireless via USB receiver, two distinct Bluetooth channels, and a convenient USB-C direct wired connection. Furthermore, the built-in rechargeable battery provides substantial longevity, promising up to four months of productivity on a single charge, effectively eliminating battery anxiety.

Priced at $129.99 USD, the Expert Mouse Pro TB900 EQ is positioned firmly at the top tier of ergonomic desktop gear. It successfully honors Kensington’s 40-year legacy while delivering the high-refresh accuracy and deep software customization that modern workflows demand. It is poised to be the definitive modern trackball.