The product is good, cheaper than the "middlemen". The battery 2032 comes with a plastic gasket, for long-term use it makes sense to buy batteries in bulk, because it is cheaper. Instruction (annotation) is clear. In principle, there is nothing complicated in the settings, but at first it may not be clear, because only one button switch. Later I will try advanced functionality (settings through the site). Slightly fog up the space between the eyes and the mask, so it would be nice to add any ventilation mechanism, heat dissipation, without disrupting light penetration (light insulation). The packaging was in good condition with a little scratch, most likely during the delivery, the product itself is not damaged.
We will test, try, use to get full experience.