Features 1、TVOC Sensor: Our carbon dioxide detector, using semiconductor TVOC sensor, has good accuracy, stable performance, strong anti interference ability, low consumption, and long service life. 2、Large Screen: The large screen of the carbon dioxide detector displays power, CO2, temperature and humidity, so you can check the air quality at any time. 3、Different Font Colors: This carbon dioxide detector use different font colors to show different air quality, 400 to 800ppm: green is normal, 800 to 1800ppm: yellow concentration is slightly higher, more than 1800ppm: red concentration is super high. 4、Rear Vents: The rear vents not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. 5、Widely Applicable: Our carbon dioxide detector is widely applicable for schools, hospitals, restaurants, shopping malls, offices, etc. Item Type: Carbon Dioxide Detector Material: ABS and electronic components Gross Weight: 380g/13.4oz Product Size: 16x9.2CM/6.3x3.6in Carbon Dioxide Detection Range: 400 to 5000ppm Accuracy: 1ppm HCHO Detection Range: 0 to 0.6mg/M3 TVOC Detection Range: 0 to 2.0mg/M3 Temperature Measurement Range: 1 to 70℃ Accuracy: 1℃ Humidity Measurement Range: 0 percents to 99 percents RH Accuracy: ±2 percents Battery: Built in rechargeable lithium battery, model: 18650, Capacity: 1200mAh, delivered with built in battery Package List 1 x Air Quality Detector 1 x Data Cable 1 x Manual