2022 letters are present (the color is gray, like English). The keys are round or oval. I use it for 3 months without turning it off, while the batteries work. Keys for adjusting the volume, brightness, etc. are present, combined with F1-F12, the main adjustment. On Windows, you can definitely change it. On Ubuntu without software from the manufacturer, I don’t know if it’s done or not. There is support for MAC and keys for it. In general, very high quality, but if you compare the quality of keySee full review