Main Unit Voltage:3.7V Subunit Voltage:3.0V Main Unit Battery:Built-in 3.7V, 2000mAh Lithium Battery Subunit Battery:2xAAA Battery(Not Included) Working Current:280mA Display:2.8 Inch TFT Screen CO2 Detection Ranges: 400-6000PPM, 5015%PPM CO2 Detection Accuracy: 1PPM CO Detection Ranges: 0-500PPM CO Detection Accuracy: 1PPM TVOC Detection Ranges: 0-2.0mg/m3 HCHO Detection Ranges: 0-0.6mg/m3 PM2.5 Detection Ranges: 0-1000ug/m3 PM2.5 Detection Accuracy: 1ug/m3 PM1.0 Detection Ranges: 0-1000ug/m3 PM10 Detection Ranges: 0-1000ug/m3 Temperature Detection Ranges: -20-55, 1 Humidity Detection Ranges: 0-99%RH, 3%RH Main Unit Size:89x83x36mm/3.5x3.3x1.4in Main Unit Weight:165g/5.8oz Subunit Size:59x59x19mm/2.3x2.3x0.7in Subunit Weight:40g/1.4oz Subunit Quantity:5pcs Colour:As Shown Material:Plastic Package Contents: 1 * Air Quality Detector Only the above package content, other products are not included. Note: Light reflection 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.