4 in 1 air quality monitor provides real-time detection of CO2, TVOC, temperature and humidity. With color alarm function to alert you in time, super practical and compact for you to carry around. Features: 4 in 1 design: carbon dioxide, TVOC, temperature and humidity display, easily check at a glance. With intelligent alarm system, gas recognition algorithm, multiple anti-interference and air convection technology. Built-in advanced sensor to measure quickly and obtain relatively stable measurement values. The color bar would be changed in real time when the detected concentration values are varying. Large screen design with clear digital display and rich color provides comfortable view. Small in size and light in weight, super portable to carry around. Specifications: Material: ABS + PVC Color: Black / White (Optional) CO2 Detection Range: 400-5000PPM CO2 Detection Sensitivity: 1PPM TVOC Detection Range: 0-2mg/ m3 Temperature Measurement Range: 0~50 Temperature Measurement Accuracy: 1 Humidity Measurement Range: 0%~99%RH Humidity Measurement Accuracy: 2%RH Built-in Battery: 3.7V 1200mAh Lithium Battery Item Size: 6.8 * 3.9 * 8.8cm / 2.68 * 1.54 * 3.46in Item Weight: 120g / 4.24oz Package Size: 14.0 * 12.8 * 4.7cm / 5.51 * 5.04 * 1.85in Package Weight: 246g / 8.67oz Package List: 1 * Detector 1 * Charging Cable 1 * Manual