Features:  Mini and portable, easy to use and carry, can be placed anywhere needed.  Large screen display makes it easier to read data.  Built-in high accuracy sensors for more accurate and stable detection of PM2.5 in the air.  The different colors of the panel indicators represent different air quality levels and it is perfect for daily air quality monitoring.  The USB design is easy to use and can extend the service time.  Suitable for many occasions, such as offices, homes, gardens, vehicles, etc.  Easy and convenient to operate and read the data.    Specifications:  A4: Detect PM2.5, PM1.0, PM20, CO₂, number of particles, temperature and humidity  Screen size: 2.8in  Material: plastics+metal  PM 2.5 measurement range: 0-2048ug/m3  PM 2.5 accuracy display: 1ug/m3  PM 1.0 measurement range: 0-2048ug/m3  PM 1.0 accuracy display: 1ug/m3  Temperature measurement range: 0-50℃  Temperature measurement accuracy: ±2℃  Humidity measurement range: 20-90%RH  Humidity measurement accuracy: ±5%RH  Item size: 85 * 65 * 43mm / 3.3 * 2.6 * 1.7in  Item weight: 117g / 4.1ounce  Package size: 180 * 120 * 100mm / 7.1 * 4.7 * 3.9in  Package weight: 210g / 7.4ounce    Packing List:  1 * PM2.5 Detector  1 * USB Cable  1 * User Manual