A Mouse That Does Not Require You to Slide Around
Most mouse that is available in the market today requires you to slide it around in order to get the cursor where you want it to be. This one does not require you to do so.
This is because it has a trackball located nearby where you would normally place your thumb. This is to allow you to control the cursor using only your thumb. As a result, you don’t need to slide the mouse here and there.
But aside from that, this mouse is enjoyed by people who have carpal tunnel syndrome. Apparently, the ergonomic shape of the mouse allows them to use it in a pain-free way.