The tester can detect carbon dioxide, PM2.5, TVOC, formaldehyde, temperature and humidity, and can store inspection data for 24 hours or even 30 days, and supports Chinese and English. You also can download T*ya APP, thus you can view the real-time detection data of the device through the APP. Features: 5-in-1 Air quality tester: it can test PM2.5, CO2, HCHO, TVOC, temperature and humidity Accurately Detection, Identify Multiple Contaminants: equipped with advanced semiconductor and Mie scattering principle, it can identify HCHO, TVOC, CO2, PM2.5, etc, test indoor air quality 24 hours. Real-time Display PM2.5 Value & TVOC Level: continuously updated test data, always let you know the quality of the current indoor air. Real Time Detection of Indoor Temperature and Humidity: 0.1 division value, industrial standard, precision much higher than ordinary temperature and humidity meter. Temperature & Humidity Compensation Calibration: precise calculation, correction of interference, and avoidance of temperature and humidity effects, make detection results more accurate and stable. Touch Screen Operation: capacitive touch screen, adjustable brightness, support touch and slide, intuitive and natural. Innovative Vent Design, Equipped Independent Sensor: vent design can full contact the air, measures more accurate, independent sensor works more efficiently. Unique Shape: 15 elevation angle design, more convenient to view and easy to operate. Rechargeable Lithium Battery: support Type-C continuous power supply, 1500mAh lithium battery, work longer time. Applicable Scenarios: it can be placed in home, office, school, wardrobe, car interior, etc Specifications: Material: ABS Main Function: CO2/HCHO/TVOC/PM2.5 detection Other Function: Humidity & temperature detection Display: Touch-screen CO2 Detection Principle: Non-Dispersive infrared (NDIR) CO2 Detection Range: 400~5000 (ppm) CO2 Detection Accuracy: 1ppm HCHO/TVOC Detection Principle: Semiconductor gas-sensitive sensors HCHO Detection Range: 0~9.999(mg/m3) HCHO Detection Accuracy: 0.001mg/m3 TVOC Detection Range: 0~9.999(mg/m3) TVOC Detection Accuracy: 0.001mg/m3 Temperature Detection Range: -40~85 Temperature Detection Accuracy: 0.1 Humidity Detection Range: 0~100% Humidity Detection Accuracy: 1% APP Networking: T*ya App/BT Screen Brightness: Adjustable(High/Low) Working Average Current: 300mA Working Peak Current: 450mA Recharging Current: 600mA Charging Time: 240min Charging Interface: Type-C(5V/1A) Power: 3.7V 1500mAh lithium battery Item Size: 94 * 91 * 42mm / 3.70 * 3.58 * 1.65in Package Weight: 300g / 10.58oz Package Size: 11.2 * 11 * 5.2cm / 4.41 * 4.33 * 2.05in Package List: 1 * Tester 1 * Charging Cable 1 * Manual (English)