Unacceptable boxes. I bought two boxes to install two Hysen HY02-B05 thermostats. On the one hand, they were warped, and on the other hand, the screws that accompanied them could not be screwed into the sockets that the boxes had, resulting in the sockets breaking and forcing the electrician, who installed them, to improvise and use wood screws. In contrast, previously when I had installed the same thermostats in boxes that I purchased from the company that supplied me with the thermostats, I had no problems at all and the boxes were just fine.

As for the build quality, it's okay; in terms of color, it's white and doesn't yellow, but on one side, they have stuck a sticker that is one of those that doesn't come off.. 4 stars just for that!