Kensington Expert Mouse Trackball (K64325)
Is the Expert Mouse right for you?
The Expert Mouse is a wired trackball with an optical sensor.
Best for
- People who'd rather steer with their fingers. Kensington lists the ball control as finger-operated and the ball at 55mm.
- A desk that left- and right-handed people share. Kensington lists it as ambidextrous.
Skip if
- Your hands are on the small side. Kensington says it's designed to fit average to larger sized hands.
- You use a Chromebook and want to remap the buttons. Kensington says ChromeOS users can't customize it through KensingtonWorks.
On a trackball you roll the ball and the trackball stays put; a vertical mouse holds your hand more upright and still moves across the desk. How the two compare is covered in our guide Vertical mouse vs. trackball: which ergonomic mouse is right for you?
Want to see it next to a keyboard and a headset? Try it on the QuickDesker board and build a whole desk setup around it.
What does it cost, and what should you check first?
- Seen at Walmart for $58.00 (Black) on 17 Oct 2026
- Seen at B&H Photo Video for $62.99 (Black) on 7 Sep 2026
- Seen at Kensington.com for $99.99 (Black) on 17 Oct 2026
- Seen at Best Buy for $106.99 (Black) on 7 Sep 2026
Prices change, so check the current one before you buy. Kensington lists the connection as wired, and lists Chrome OS, macOS and Windows as its operating systems.
The button and speed settings come from KensingtonWorks, which Kensington calls free downloadable software, and its note says Windows ARM-based computers are currently not supported.
Kensington lists a limited 5-year warranty, and its page describes a detachable wrist rest.
What can you do with the Expert Mouse's four buttons and scroll ring?
Kensington lists 4 buttons and says KensingtonWorks lets you customize all 4 and set cursor speed. Its feature notes add that you can assign a wide variety of program functions to each button and control the pointer speed and scrolling speed. Kensington lists a Scroll Ring, which it describes as a dial you spin to move up and down web pages or documents.
What does 400 DPI mean on a trackball?
Kensington lists the sensor as optical, using its DiamondEye optical tracking technology, and the DPI as 400. DPI is how many steps of movement a sensor reports for each inch of travel, so at the same settings a higher figure moves the pointer further for the same motion. On a trackball that motion is the ball turning under your fingers, since the trackball itself stays still. Kensington describes the ball as a 55mm sphere.
Full specifications
| Buttons | 4 |
|---|---|
| Programmable controls | Customize all 4 buttons, set cursor speed |
| Handedness | Ambidextrous |
| Sensor type | Optical |
| Sensor | DiamondEye™ optical tracking technology |
| Maximum DPI | 400 |
| Connections | Wired |
| Remapping software | KensingtonWorks™ |
| Warranty | Limited 5-year warranty |
Kensington's Expert Mouse Wired Trackball product page doesn't list a polling rate, a weight, a switch rating, silent clicks or onboard profiles.
Specifications from Kensington's Expert Mouse Wired Trackball product page, read 7 Sep 2026.