Before buying, I read similar reviews, but did not particularly betray the value. The warranty has expired, now you have to buy a new one. Its pros: While working with her, everything was fine, but only the rubber bands had to be re-glued with normal glue on the side. Cons below: Just one fine day, out of the blue, a message began to appear that you need to install a new firmware, although everything worked well. It was reinstalled 5-6 times, but something didn’t work, well, then it just turned off and doesn’t turn on anymore. For a couple of days I worked only with the wire, I completely reinstalled their drivers, she again asked for the firmware, but after reinstalling it simply stopped working.