According to a review on TweakTown, this mouse uses a PMW 3320 optical sensor which seems very good for the price.
It’s available on both Amazon and Ebay from the same seller that claims to provide full warranty, shipping is free.
https://www.amazon.com/Azio-3500d…o%2B1&t
http://www.ebay.com/itm/Azio-3500…SwZJlXM6
Link to Review:
http://www.tweaktown.c
I personally bought 2 as backup/spare mice for my SS Rival 300 and the one that was already delivered feels really solid.
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