15 functions: can detect CO2 (carbon dioxide), CO (carbon monoxide), HCHO (formaldehyde), TVOC (total volatile organic compounds), PMO.3, PM1.0, PM2.5, PM10, temperature & humidity, AQI (air quality index - mainly comprehensive particulate matter) and other parameters, and comes with WiFi remote, date and time, alarm, timer, timer and other functions 2.8" screen: Using a 2.8-inch TFT display screen, the data display is clear and easy to observe App remote monitoring: You can use the Tuya APP to remotely monitor data in real-time, and you can set alarm values, sleep time and view daily, monthly and annual historical data of detection parameters in the APP Large capacity battery: Built-in 2000mAh large capacity lithium battery, get rid of cable annoyance, convenient to use and charge 3 data display colors: According to the default safety value of the manual, it is divided into 3 data display colors: green, orange and red Specifications: CO2 detection range: 400-5000PPM CO2 detection sensitivity: 1PPM CO detection range: 0-999PPM, ±10PPM CO detection sensitivity: 1PPM Built-in lithium battery: 2000mAh 3.7V Charging time: 2-3 hours Use time: 240-360 minutes Net weight: 160g Note: Avoid exposure to high temperature, humidity, rain and other environments that may affect product components. Please use standard DC-5V charging.