Questions about Nacon Gaming Gm-300

Yes, this is possible with the corresponding programme. If you do not download a programme, it simply changes colour. However, as this happens 'gently', it is not disturbing. It is also possible to switch off the colour completely. Hope I could help (:

You will hardly notice a difference in the response time of mice. However, 2800 dpi seems a bit low to me. If you want a budget gaming mouse, this one looks better: Logitech G G203 Prodigy (Cable)

As far as I can remember, this button was configured as a triple click by default (for whatever reason). But that can be easily fixed by downloading the Nacon software and changing the button assignment. Link: http://nacongaming.com/product/gm-300-optical-mouse/