Comprehensive Air Quality Detection: This air quality detector is a 15-in-1 device that measures AQI, CO, CO2, PM0.3, PM1.0, PM2.5, PM10, formaldehyde (HCHO), TVOC, temperature, and humidity. It also features time display, alarms, timers, and countdown functions, providing a complete solution for your air quality needs. TFT Color Display and App Control: The indoor air quality monitor comes with a 2.8-inch TFT color screen, allowing you to see the test data at a glance. With the Tuya app, you can enjoy real-time air quality monitoring and remote management from anywhere. Customizable Settings and Historical Data Review: The portable aqi pm0.3 pm1.0 pm2.5 pm10 tester supports custom alarm limits, sleep mode settings, and detailed historical data exploration (by day, month, or year). The app offers a user-friendly interface with temperature unit switching and multifunctional timer settings for a personalized and convenient experience. Alerts and Visual Warnings: Connect the household co co2 tvoc hcho tester to WiFi and set alarm values as needed. When measurements exceed the set standards, the device emits three urgent beeps and changes interface colors (green for good, orange for warning, red for bad), ensuring immediate response with clear visual alerts. Smart Linkage Control: Featuring semiconductor sensors for accurate measurements, the temperature humidity meter can connect to smart plugs to control external devices. For example, set the exhaust fan to turn on when CO2 levels exceed 1500ppm and off when levels drop below 800ppm, saving energy. Ideal for homes, schools, hospitals, kids' rooms, hotels, restaurants, cars, and more. Gas Type: Multifunctional With LCD Screen Or Not: Yes Is Smart Device: YES Battery: 2000mAh polymer lithium battery (included) Working voltage: 3.7V Working current: 260mA Carbon dioxide detection range: 400-5000PPM, ±50±5%PPM CO2 detection sensitivity: 1PPM CO detection range: 0-999PPM, ±10PPM CO detection sensitivity: 1PPM TVOC detecti