1. Protect your every breath Clean air means a lot to everyone. HARMNHLT indoor air quality monitor can accurately monitor PM2.5, PM10, CO2, HCHO, TVOC, temperature and humidity, all displayed on an ultra-high-definition color screen for easy identification and reading. With its convenient design, you can monitor the environment at any time and effectively measure the 7 key indicators for evaluating air quality. 2. High-precision and fast refresh data Equipped with fast-response and sensitive high-performance chips. Adopt high-precision infrared (NDIR) sensor technology for measuring CO2, PM2.5, PM10. Electrochemical sensor for measuring HCHO and TVOC. 5 readings refreshed every 1-2 seconds. Compared with ordinary sensors, it is more sensitive, more accurate and more stable. 3. Long battery standby The air quality detector has a built-in 800mAh battery and comes with a USB charging cable. It can be used continuously for about 6 hours after being fully charged. Do not use it while charging or when the power is low, because the data may not be very accurate. Built-in low-power processing chip, can monitor air quality uninterruptedly for a long time. It will always take care of you and your family. 4. Widely applicable Our temperature and humidity sensor has a compact design, simple appearance, beautiful and portable, suitable for bedrooms, living rooms, kitchens, offices, cars, schools, hotels, basements, cellars and restaurants. The data cable adopts TYPE-C USB interface. 5. Warm Tips Please note that this air quality monitor is designed for indoor spaces, so please close the doors and windows before testing. Otherwise, the data may be inaccurate. We recommend using the monitor and keeping it working for at least 60 minutes before reading the data.