Kensington Pro Fit Ergo Review

Kensington Pro Fit Ergo Review

When I think of a computer mouse, I generally think of the device you move around the desk to move the cursor. You know the typical mouse with an optical sensor. But that’s not entirely correct as there are also computer mice that are almost completely different from that. I’m talking about the devices that are equipped with trackballs and you don’t move them around at all. This type of mice are extremely ergonomic and can take the pressure off the wrist. Which is fantastic for people who suffer from various wrist issues, such as carpal tunnel.

One of the highest rated trackball mice is the Kensington Pro Fit Ergo. To be exact, it’s one of the best selling and highest rated trackballs in the market. It’s designed to be stationary on your desk and as ergonomic as possible. And the best part, it still has some traditional mouse features as well! Which is one of the main reasons why I wanted to review it.

Technical Specification

  • Dimensions: 136×86×67 mm / 5.4×3.4×2.6″
  • Trackball size: 34 mm
  • Programmable buttons: 9
  • Type: Wireless
  • Connection: USB-A dongle & Bluetooth
  • Adjustable DPI
  • Battery Life: Up to 18 months
  • Operating systems: Windows & Mac

In The Box

  • Kensington Pro Fit Ergo trackball
  • USB-A receiver
  • 2x AA batteries


The Kensington Pro Fit Ergo doesn’t exactly look like a typical trackball device. It looks more like a futuristic mouse from a sci-fi movie. It has this unique design that makes you hand grip it vertically (60 degree angle to be exact) and the trackball sits at the top. So you move the ball with your thumb and you can use your other fingers to operate the buttons. The idea behind it is to keep your hand neutral and stop it from twisting at the wrist.

Kensington Pro Fit Ergo Design 2

In terms of size, it’s designed for medium to large sized hands. It has an overall dimension of 136×86×67 mm / 5.4×3.4×2.6″. You can technically use it if you have smaller hands as well but it won’t be as comfortable as it’s a pretty big device. And this device does have buttons like a conventional mouse as well. So it’s pretty important that it sits well in your hand.

In terms of buttons, the Pro Fit Ergo has in total 7 plus a scroll wheel. Besides the two left and right click buttons, there are also two buttons for back and forward. They are placed near your index finger so that you can conveniently use them. The rest of the 3 buttons are placed near the trackball and 2 those can be customized and the other one is for choosing between different connections. The 4 main buttons all and even the scroll wheel can also be customized. The scroll wheel can also be clicked and even tilted left or right. Not to mention the scroll function of course.

Kensington Pro Fit Ergo Design

The bottom of the trackball has a compartment for two AA batteries that power the device. As you can see from the design, there are no cables. You can use either a USB-A wireless dongle or Bluetooth to connect the device to a computer. The tiny Kensington USB dongle has also got its own slot at the bottom. Which is convenient as you won’t need to worry about misplacing it if you need to take it with you. Oh and there are also rubber pads at the bottom that stop it the device from sliding around.

Setting Up

So as I mentioned before you can use either a wireless USB dongle or Bluetooth to pair the device. You can actually use both of them simultaneously as well. And you can use the 3 buttons near the trackball to switch between the connections.

The Pro Fit Ergo also works with Windows and Mac operating systems. There’s the KensingtonWorks software that you’ll need to download and install. From there you can configure everything about the device and even assign keyboard shortcuts. Plus it’s a really straightforward program that’s easy to use.


The most important part about a trackball mouse is obviously the actual trackball. And that is definitely the strong point of the Pro Fit Ergo. It’s really easy to control and it moves smoothly with hardly any stutters. If you do notice some friction then that’s most probably caused by the bearings and it can take up to a week at first to remove it. The ball itself though has a smooth finish that’s just right. As in it’s smooth but it still has enough grip. And most importantly it’s incredibly easy to clean as Kensington has even included an eject button so you can easily clean the trackball and the socket.

If you are new to trackballs then you’ll also appreciate the adjustable DPI. It can be difficult at first to get used to the device so changing the DPI level definitely helps. It’s also great for designers who sometimes require lower DPI for more accurate movements.

Oh yeah about the battery life, according to Kensington, the AA batteries should last up to 18 months. Which is actually much better than I expected. Unfortunately it does not come with rechargeable batteries so I do recommend eventually switching to those.


I have reviewed a lot of different devices before but nothing like the Kensington Pro Fit Ergo. Overall it’s exactly as advertised. It’s a unique and ergonomic trackball that includes a bunch of conventional mouse features. Which makes this a great device for people who have never used a trackball before. Plus its ergonomic features have fantastic wrist health benefits as well.