The Logitech M570 is the most ergonomic mouse on the market. As a doctor, I find it relaxing and to the point. The software allows you to fine-tune the controls. Others have had M570 button failures, but my scroll wheel failure is the only failure I've had with any of the other 5 I've owned in years of heavy use. I'm not sure about the term "refurbished" that some sellers often use in the descriptions of the M570. I never bought them and this perhaps explains the excellent results I've had over the years compared to the few button failures described by others. Logitech software makes it easy and almost instantaneous for your computer to recognize your mouse. Takes only a few seconds and only on first use during installation. The very small wireless USB connector is unobtrusive and remains in the computer's USB port. For the price, these devices can't be touched. In terms of ergonomics and prevention of wrist pathologies, these trackball devices are superior to all others.
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