When I got this, it took me some time to get used to it. The whole point of a trackball (aside from not requiring a surface) is its ergonomics, but the button layout on this trackball is so awkward that my hands get tired after daily use. Like anything with wheels, you'll need to take the ball out and brush off the lint about once a week to keep it moving smoothly. Unfortunately after a few months the entire top with the electronics decided to pop out and I lost 1 of those (tiny tiny) rollers which made smooth movement incredibly frustrating. The second time the top fell off (nothing fixes the top!) I lost another roll on the opposite side. This surprisingly made it work BETTER than just missing one, I think because there isn't the same resistance on either side (but still worse than having both installed). The pieces are so small that even in the shortest rug the size of a grain of rice, they are instantly lost. I would not recommend this device to anyone based on its form factor or durability. Touch sensors for scrolling. enough, but I wish it supported multi-touch with at least two fingers since the sensor is on either side of the trackball. In general. This device completely turned me off from Kensington products. I would order a trackball from Logitch or Microsoft if they touched with a finger instead of a thumb. I decided wireless wasn't worth it and ordered a Logitech marble mouse instead. I will miss scrolling with the mouse. But I'm pretty sure I can assign one of those keys as a scroll lock and then use the trackball itself. The problem is solved. I do not recommend. But it still works even though it fell apart, so I can't give it a star. However, the seller was very good, I received the goods in record time.
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