Features: The JD3002 Air Quality Monitor delivers professional accuracy in detecting CO2, formaldehyde, and VOCs through advanced sensors technology, outperforming traditional detectors with ±5% measurement precisions for environmental analysis. Featuring a LCD screen with real time data updates every 2 seconds, this portable analyzers provides instantly visibility of air quality through numerical displays and trend graphs. Ideal for families with children/elderly members, school administrators, and laboratory technicians requiring continuous indoor air safety monitoring. Designed for versatile deployment in bedrooms, offices, classrooms, or medical facilities, its lightweight ABS construction (0.68lbs) enables effortless relocation between monitoring zones. The integrated alarm sound/visual alerts when detecting hazardous thresholds, while energy efficient operations ensures protections with minimal power consumption. Specifications: Component: ABS Battery: 3.7V, 1800mAh (included) CO2 measuring-ranges：380-2000ppm TVOC measuring-ranges：0.000mg/m³-2.000mg/m³ HCHO measuring-ranges：0.000mg/m³-1.000mg/m³ Temperature measuring-ranges: 0℃-90.0℃(32℉-194℉), ±1℃/±1℉ Item size: 176x73x29mm / 6.93x2.87x1.14in Package:Paper Box,Plastic Box Package Includes: 1Piece Air Quality analyzers note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.