This detector is suitable for indoor and outdoor air quality, muti-envornmental air quality monitoring for furniture, decorations, cars, etc. 4.3 inch LCD screen, 480 * 270 pixels, simple and elegant, with high test accuracy, stable performance, with clear and easy to understand digital display, let you know the current air quality at a glance eye. Small and portable but with great wisdom, compact, and economical portable PM2.5 detector to escort your healthy environment. Built-in lithium battery and usb rechargeable, charging and using, battery life, not afraid of power failure. On-board fan to draw in ambient air for more precise real-time results. Functions: low battery warning, time setting, history recording. Test Variables: PM2.5, PM1.0, PM10, HCHO, covt, carbon dioxide (CO2), temperature, humidity, you can get the results you care about. Unit: change the temperature unit between Celcius () or Fahrenheit (fairy). Buzzer: Use the up / down buttons to select whether you need to turn on / off the alarm buzzer. Alarm threshold: factory default alarm threshold levels for HCHO: 0.1 mg / m; When the range 0.1 mg / m and above 3; the device alarm sounds. HCHO perfect range: less than = 0.10 mg / m. Specifications: Battery: 1 * lithium battery, 3000mAh Display : 4.3 inch LCD screen, 480 * 270 pixels CO2 detection : infrared (NDIR) Particle detection : scattering Sampling time: 1.5 seconds Detection temperature: -10 c ~ 50 c Relative humidity: 20% ~ 85% CO2 Concentration Unit: PPM Unit of Concentration for particles: / m3 Unit of Concentration for HCHO and covt: mg / m3 CO2 Technical Indicators: Measuring range: 400-5000PPM CO2 sensor: infrared (NDIR) Resolution: 1 PPM PM2.5, PM10, PM1.0 specifications: Measuring principle: diffusion Measuring range: 0-999ug / m3 Resolution: 1 / m3 Formaldehyde specifications: Measuring principle: electrochemistry Measuring range: 0.000-1.999mg / m3 Resolution: 0.001 mg / m3 COVT specifications: Measuring principle: semiconductor Measuring range: 0.000-9.999mg / m3 Resolution: 0.001 mg / m3 Technical temperature and humidity indicators: Measuring range: -10-50 Measuring accuracy: +/- Humidity range: 20% -85% RH Measurement accuracy: +/- 4% rh Colour: black Material: ABS+metal Package Contents: 1 * Air Quality Detector 1 * English User Manual 1 * USB Cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.