For the first time I encountered Kitfort equipment. Didn't expect such good quality. Ergonomic backlight "night light". The air quality indicator, moreover, was checked for operability, namely, they let smoke on it and it immediately switched to red mode and quickly cleared everything. Not the slightest smell of smoke remained. Another would be the function of connecting to a smart home, and in general there would be no price for it. I recommend this device for purchase!