In terms of physical hardware changes, you can pick from a great laser sensor or an even-better IR LED sensor. Once you've got those figured out, you can swap left and right mouse button switches and you are good for at least 70 million clicks. It's a great feature to have and it eliminates SKUs for EpicGear to try and market. You get everything you need and more and while it's not a budget priced mouse, you are getting a lot for the price...
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