COLOR AND SOUND ALARM: The color of the corresponding to a single gas changes according to the gas concentration, which are Good(Green), Moderate Pollution(Yellow), Poor (Orange), Unhealthy four grades. When the Normal is exceeded, the device emit a ticking alarm sound, the indicator light flash continuously and the interface color change. You can acquire in real time which gas is unsafe and take action accordingly to enhance the air quality MULTIFUNCTION MONITORING: This indoor air quality monitor provides real-time monitoring of 9 crucial indexes including , CO2, PM1.0, PM2.5, PM10, HCHO, , temperature and humidity. air quality monitor keeps you informed of current air quality levels at all times to the breath health of your family CLEAR DISPLAY SETTINGS: Air Quality Monitor has a LCD screen display, each data is clear with color reminder , easy to understand. The screen brightness can be adjusted according to your needs, allowing you to understand the indoor air quality at a glance. HIGH-PRECISOIN : The air quality meter is equipped with NDIR infrared carbon dioxide sensor, laser particle sensor, semiconductor sensor, photoelectric sensor, temperature and humidity sensor, which responds quickly and sensitively, and provide accurate indoor air concentration LONG BATTERY LIFE: Equipped with a 2500mAh battery and Type-C Charging Port, easy to use and portable. Our air quality monitor provides up to 11-12 hours of continuous use on a full charge. With a low battery consumption processing chip, it enables uninterrupted air quality monitoring to safeguard you and your family's health., Manufacturer: Akfldms