Very limited options when it comes to a left-handed mouse or trackball, especially wireless ones. This Elecom trackball is a very worthy product. Pros: Lots of customizable button options. Not too big or small. Consider it a good size. The clicking doesn't require too much force. Cons: Spinning/spinning the scroll wheel requires a lot of force compared to a Logitech, Corsair, or Razer scroll wheel in my experience. No fast scrolling/hyper scrolling like the Logitech mouse. Current trackballs from Logitech also don't have hyper-scrolling. I wish that Elecom solves the problem in the next iteration. The included trackball is not that smooth. Switched to a Periixx trackball and it moves better. Still not as smooth as the M570 Netural: Japanese manual included. Don't think they are targeting the American market. It is difficult to find such software on the Elecom website. When I found the link it didn't work. I wish they would take care of the American market. Bottom line: I'm not aware of any other left-handed wireless trackball option. It is, and it should get better. 3 stars for the product. One for Elecom not to ignore left-handers.
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