There's also a DPI switch button that can be used to change pointer speed on the fly.
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The mouse buttons are clicky and responsive, and the forward/back buttons are great for quickly moving back and forth between web pages. A higher DPI is important for people who struggle to move their mouse a lot, so this is fantastic to see. The optical sensor is accurate and responsive, and it has a DPI range of 400 to 4000, which is the highest DPI maximum I've ever seen a vertical mouse achieve. In terms of hardware, the Logitech MX Vertical is awesome as well. However, my mother does, and after I let her use it for two days she said that it helped a lot and that she loved it (It's no longer in my possession).
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As I don't have hand pain, I couldn't determine how this mouse alleviates those issues. Also, despite not being notably lighter then many other mice on the market, the Logitech MX Vertical feels light as a feather, which must mean that Logitech used some secret design tricks. In addition, nearly the entire mouse is designed with a soft, felt-like material with a contoured texture that fits the human hand perfectly. The large thumb rest on the left side of the device is large enough to rest your thumb on completely, and you don't even need to use your muscles to grip the mouse unless you want to pick it up.
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Rather, the mouse is holding your hand instead. What's incredible about the Logitech MX Vertical, though, is that it feels inaccurate to say that your hand is holding the mouse. Like all vertical mice, the Logitech MX Vertical was designed with the goal of making it strain-free to hold with your hand in order to reduce the symptoms of - or help eliminate - conditions such as carpal tunnel.