That part stinks to high heaven. When I now times longer time used (more than 3 minutes), they began to stink so that I only thought the notebook by burning what. Since the surface is mostly kept in a matt black and slightly nachgebigem material, I believe that respect. The smell (like burning plastic langssam) is the cause there. I still lie within the 30 day return period and carried the shipment via Amazon, I'll try a return. Actually a pity, because it was very good in the hand. Pay me now a buy no rubber but has a hard surface. Although the price was good not justify the endangering health.
Update: After contacting Amazon, the mouse can be returned. Super service from Amazon.
