Indoor Haze Dust Formaldehyde Air Quality Detector 1. Material: ABS 2. Display mode: 2.8-inch LCD screen display, 320 x 240 pixels 3. Atmospheric pressure: 86Kpa - 106Kpa 4. Detection method of PM: laser scattering 5. Sampling time: 1.5 seconds 6. Detection temperature: -10 degrees celsius to 50 degrees celsius 7. PM (PM2.51.010) concentration unit: ugcubic meter 8. Concentration unit of HCHO and TVOC: mgm3 9. Power supply: 2000mAh lithium battery; 5V DC power charging via USB port 10. Can detect formaldehyde (HCHO), total volatile organic compounds (TVOC), particles less than 2.5 microns in size (PM2.51.010), temperature and humidity, with clock and recording functions 11. Onboard fan draws ambient air for more accurate real-time results 12. The formaldehyde alarm threshold is 0.1 mgm3, if the HCHO level exceeds this alarm threshold, the device will sound a short beep alarm 13. Product weight: 183 grams 14. Product size: 164 x 69 x 44 mm Packing list: - Air quality monitor x 1 - Micro USB charging cable x 1 - Product manual x 1