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  • Kensington Expert Mouse Optical USB Trackball for PC or Mac 64325
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Kensington Expert Mouse Optical USB Trackball for PC or Mac 64325


List Price: $94.99
Price: $69.00 & FREE Shipping. Details
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$69.00 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

Kensington Expert Mouse Optical USB Trackball for PC or Mac 64325 + Microsoft Natural Ergonomic Keyboard 4000
Price for both: $98.99

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Product Details

Supplementary Guide [83kb PDF]
  • Product Dimensions: 3.5 x 9.8 x 9.8 inches ; 1 pounds
  • Shipping Weight: 3.1 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B00009KH63
  • Item model number: K64325
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (1,076 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: May 29, 2008

Product Description

Kensington Expert Mouse Trackball
Award-winning Scroll Ring for precise fingertip scrolling.
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Expert Mouse Trackball

The Expert Mouse employs Kensington's DiamondEye optical technology for smooth, precise cursor movement. Surrounding the ball, our award-winning Scroll Ring lets you scan up and down the screen with complete ease. The height of comfort, the Expert Mouse even comes with a soft wrist rest right in the box! In addition to all these great features, you'll find the same large ball, exceptional control, four programmable buttons and ease-of-use that have set the standard in trackballs for more than 15 years.

DiamondEye Optical Technology

Optical sensing provides precise tracking for superior accuracy while moving the cursor around the screen.


Comfortable Ambidextrous Design

Works equally well for either right-handed or left-handed users while taking up less desk space than needed to operate a mouse. Provides more comfort during extended use through reduced arm and wrist movement.

Large Ball and Scroll Ring

Reduce hand and wrist movement and offer precise fingertip control while scrolling.

Detachable Wrist Rest

Cradles your hand in softness to make working on your computer as comfortable as possible for better productivity.

Plug & Play

Get clicking and scrolling quickly with fast, reliable, and intuitive installation through the wired USB connection.

TrackballWorks Software

Allows you to program the pointer speed, scrolling and button functions for a personalized experience.

Universal Acceptance

Compatible with both PC and Mac computers.


Customer Questions & Answers

Customer Reviews

The scroll ring is a very nice feature.
Nathan A. Sweet
There will be no Kensington Mouse Work's software support on windows Vista and there is no way to program the extra buttons of the mouse or trackball in Windows Vista.
William Raab
The included wrist rest helps keep your hand at a good angle for use.
P. Perrey

Most Helpful Customer Reviews

228 of 237 people found the following review helpful By Platypus Rex on February 4, 2004
Verified Purchase
Almost every day I work for hours using a Computer Aided Design program, and over the years have found the Kensington Expert Trackball to be an indispensible labor (and arm) saving device. You get so much with so little movement! I was looking to buy a new one.
I had misgivings about this product after reading some "Worse than Bad" reviews that were in this forum. Still, either because hope springs eternal or a fool and his money are soon parted, I went ahead and ordered one.
Out of the box ball rotation was _The Worst_ as others had said. I had deadlines, however, so decided to use it to see if anything would improve. Two hours later it had "broken in".
Trackball Wizards, my number five is on the trophy shelf. The Seven is AAMMAAZZIINNGG. Totally silent movement; virtually frictionless rotation; excellent functionality, and it has GOT to have one of the most eloquent designs of any input device on the market.
As an added bonus the scroll ring beats any scroll wheel I have used, anywhere.
Congratulations to Kensington for creating a truly superior product.
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98 of 104 people found the following review helpful By Shelley Gammon TOP 1000 REVIEWERVINE VOICE on November 21, 2003
This is a superior alternative to the silver and blue USB model by Kensington with the awkwardly placed scrollwheel. Kensington brings back their award-winning classic design, adds a scroll wheel around the ball (programmable for lefties or righties!), a free attachable wristpad and all using optics - no more skin, hair and potato chip crumbs getting stuck in scroll wheels... it's all done using light.
My less than perfect rating is for the less-than-fluid turning of the scroll wheel. It sometimes feels like you're grinding coffee when you're turning it. Sometimes it's smooth like butter, other times, it seems to skip a little... and it's not due to debris, since it's been like this since I got it out of the box.
This is something Kensington needs to iron out in their next model.
Despite this one flaw, this is simply the best their is and there's a good reason why this mouse flies off the shelves at nearly 100 bucks a pop - it's because it's the best input device alternative to a mouse - ever - anywhere.
Do your wrist a favor and treat yourself to navigating in joy.
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202 of 224 people found the following review helpful By Nathan A. Sweet on April 5, 2006
Verified Purchase
I got this trackball because of wrist pains in my mouse hand. I will give my complete unbiased review here.

First, it is very pretty. The buttons are nice looking and easily clicked. The ball is a nice size.

The trackball comes with a wrist rest, however it is not comfortable if you use your fingertips to move the ball. In fact, the Kensington documentation states that your hand should "hover" when using your fingertips to move the ball. The reason is, when you move the ball towards you, your fingers have to bend and your wrist bends upwards. In order to keep your wrist straight, you have to hover your palm over the wrist rest. So why did they include a wrist rest?

The only other configuration possible is to rest the blade of your hand, pinky side down, on the wrist rest and use your thumb to move the ball. This position feels good, however I found I am much less accurate with my thumb. Also if you have any thumb pain, this position is not feasible.

The scroll ring is a very nice feature. However, as everyone else has found, it sounds like it has sand in it when rotated. I took it apart and lubed it with a plastic safe grease. Even though I worked the grease into the mechanism, the plastic bearings still make the grinding sound while saturated in grease. I can't get to them to see if they can be replaced without breaking the plastic, which has been melted closed.

The ball was stiff out of the box. The ball sits on three very tiny red balls, which act as bearings. Remove the ball and put a small dab of grease on these bearings, replace the ball and spin it, then remove the ball and clean it. Clean up all the lube from the bearings so they don't get the ball greasy.
Read more ›
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139 of 160 people found the following review helpful By Borias on January 20, 2007
Verified Purchase
As a longtime trackball user (with one of my favorites being an older model of the Kensington Expert mouse) I was very excited about this one. The features were outstanding, the trackball movement and precision flawless, and the scroll ring was very useful. However, the trackball housing itself is constructed on a very steep incline. Even with the wrist pad that's included, it put my fingers in a big strain to operate the ball (I have average sized hands). It's tilted up, so that you have to reach up and out to use the ball. This puts strain on the tendons of your whole hand, and also presses the nerve cluster at the base of your hand against the pad or table. After using it for about a week, my hand was in agony.

Earlier Kensington Expert Mice were almost flat, and were very comfortable. It's baffling to me why they made this change in the design.

Kensington did take this mouse back for a refund even though I had used it for a week (all I could stand). It may be that this unit is comfortable for someone with very large hands. I've gone back to my Logitech Marble Mouse, regretfully -- if not for the incline, the Kensington would have truly been the perfect trackball.
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