German company. It is full-size and for my hand, it is perfect in the palm so as not to tire during use. It looks sturdy and high quality. Now, as for durability, it will show over time. It has three sensitivity options (dpi) with buttons and an LED indicator of different colors. The LED lights up momentarily, it is not permanently on. The scroll wheel has a good feel and seems to do its job well. I would say it is rather quiet, it makes a barely noticeable click. On the left, it has two more buttons for forward and backward screen, if I'm not mistaken, although I haven't used them at all. There is an application that can be downloaded from the company's website for programming functions on the buttons. The package also includes two batteries. The instructions say that it can also work with just one battery to make it lighter. The specifications mention battery life of up to three years with one hour of daily use. If you don't move it, it goes into idle mode and immediately resumes with the first movement. It also has an on-off switch. I have had it for about a week and so far, I really like it both in terms of appearance and use.