In general, a good thing. Of course, you need to order on Ali and not overpay local hucksters, the price sometimes differs by 2 times. For example, now on Ali it is 9 thousand (and it was even 7 thousand), and here it is 16 thousand. There are versions 3C, 3H and just 3. They differ insignificantly, you can order any. There are 3 modes of operation: manual (when you choose the fan speed yourself, 3 degrees), auto (when the device controls the transparency of the air and drives the fan) and through the application, to which I somehow failed to connect the device. But the application, in principle, is not needed, in auto mode everything works well. I really liked working with a soldering iron, as soon as a cloud of smoke flies out, the fan immediately picks up speed and it in, cool )) Definitely disappointing with the build quality. In my copy, at low speeds, the fan crackles, at night it is very audible. Despite the fact that it does not hit at high speeds. I don't know how it could be, apparently it's still a bearing. I haven’t taken it apart yet, I ordered another device, I’ll see how it will work. You need to put them 1 in each room, otherwise it makes no sense. But this is health. I live in the center, we have 3 cafes in our house and it saves a lot from the constant smell of barbecue. Filters are not cheap (about 3 thousand), but it's better to buy the original of course. In my case, the filter is enough for about half a year (the device itself shows its consumption, apparently, based on the fan speed).
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