Official mouse. but she has a really problematic wheel, there are a lot of negative reviews about the wheel, I thought it was garbage, but it's true. : I handed over the mouse under warranty, took the same one, the problem with the wheel appeared after a few months, because of which the impressions are very worse. Got pros: Form Included were additional switches / side buttons of a different color Proprietary software Working hours The wire is VERY light, sometimes I don't notice that in wireless mode. With its cons: The wheel broke after six months, I decided to contact the service, almost immediately they issued an act of non-repairability, I had to change the whole mouse.