Product Overview Display Air Quality Indicator One of the colors below will display according to the PM2.5 value: Green 0 — 75 μg/m 3 Orange Red 76 — 150 μg/m 3 150 μg/m 3 or more PM2.5 Value Mode Automatic: Automatically switch modes according to the indoor air quality. Power Button Night: Ultra-low noise for a comfortable sleeping environment. Mode Button 1: Low speed 2: Medium speed 3: High speed Temperature Manual: Set and save the coverage area and the purifying efficiency in the app. Humidity Wi-Fi Indicator 3