Also, the light to let you know it?s charging, is ridiculously bright (at night whilst trying to sleep) it?s not just an issue of this product, but every other product on the market. Got em in 2 days which was great. I ordered my normal size 7. My testing is as follows:Desktop: Ubuntu 20. Poor quality control I suppose. They are really lightweight and a lot less bulky compared to many others on the market. There is no capability on the mouse (or the corresponding keyboard) to preserve ANY settings when the Razer system tray app is exited. This one I purchased for my wifes bike. They last forever and have different fit options. To be honest I don?t use this for gaming.