KensingtonACCO TRACKBALL EXPERT MOUSE OPTICAL

I bought it from Amazon and used it for less than three months before it stopped working. A complete waste of money.

I have done a lot of ergonomics work for a major bank. Carpal tunnel syndrome or repetitive stress injury is a common problem for people who use a computer mouse extensively.The Kensington Expert Mouse is an excellent alternative that will help a lot. Depending on how bad your case is, you may find yourself using this alternative for a year or more.The problem arises in most people because they use the mouse incorrectly or it is too small for their hand. More on this later...The expert mouse is so effective because it decouples positioning from the click or selection process. You position the pointer with the center of the middle three fingers (fingers are not bent), THEN, you select the target by using the thumb to click a button. These are TWO separate actions. There is nothing to hold or squeeze.The correct way to use a mouse is to NOT grip or hold it, but to simply "ride" it with your open hand. The clicking operation should be done with a straight finger, not a bent one.In some operations, the Kensington Expert Mouse is quite handy because you can park the pointer in a specific position and it will stay there.One of the unique features of this Expert Mouse is the 55mm size of the ball - about the size of a pool ball. . Devices with smaller balls will be much less effective. Another is the positioning in the middle of a cradle that allows you to use your flat fingers, not your thumb. If you periodically clean the expert mouse, it will last many years. There is virtually nothing to wear out.

j"adore ce trackball c'est le troisième que j'achète et utilise. par contre kesington pourrait fournir des pilotes mis à jour pour les utilisateurs Mac comme moi! ce qui est tele chargeable ne fonctionne pas. c'est pas très sérieux.

Estoy acostumbrando recién pero ya se va notando la facilidad al momento de producir música que para eso lo compré ! Estoy feliz

I used trackballs of varying types all the time years ago and just got away from them with time as I was working mostly on the run with laptops. These days I'm fixed at my desk a lot more and decided after having a defective Logitech Hero that kept double clicking things that I'd try one of the Expert Mouse units again.Very solid build, modern level of resolution and the software allows for some nice customization of the mappings and button assignments.I have fairly large hands and find this more comfortable that a typical mouse. My hand doesn't cramp up as much.These track balls are best for "consuming" media or operating the controls of software applications, if you really need fine control a traditional mouse or better yet, a digitizer pen are better options. It does take a few days of adjustment if you have never used one. You will want to experiment with the acceleration and speed thresholds and the button modifier to go to high resolution, fine, slow mode is very handy too.The only thing to know and I already did from years ago is that you basically lift the ball out and clean the guide posts pretty much daily to keep them nice and smooth. I just use a dry napkin to wipe them off, nothing fancy. The ball rewards clean hands, it's not going to treat you well if you keep using it during a nice lunch of fried chicken.

When I unpacked it, I realised it's just a regular laser mouse, with the sensor tracking the ball instead of the table surface. Not really sure it's worth the 100€ price.Now, regarding the ergonomics, it's been only a bit more than a week, and while I'm not back to the accuracy and speed as I was with a regular mouse, I'm already seeing some benefits. I love how I can just spin the ball and move the cursor through 3 displays without any issue.Now, why only 3 stars? Well, when I leave my PC sleeping, after it wakes up, the trackball doesn't work. I have to replug it so I can use it, which is very annoying, as it means that almost every time I go back to my PC, I have to get to the PCs back, unplug it and plug it back again. It did not happen with any mouse or keyboard that I've been using before. If this problem persists, I'm thinking of returning it, just because it's so annoying, maybe getting another trackball.