Like most high tech hardware manufacturers, Razer pretty much require you to install their software to get the most out of this - and unfortunately there is a common fatal problem with that software. You can find fixes for it on Razer's web page, but they did not help me. When the mouse worked it was fine - but that was only for a day or 2 before i'd had enough of it due to uncommanded PC shutdowns and failure to actually work at all. Kudos to PBT for a prompt refund - but seriously cannot recommend anything from Razer until they sort their **** out! :/