Features： 1、Infrared Models: The carbon dioxide detector adopts infrared probe, which has good accuracy, stable performance, strong anti interference ability, low consumption and long service life. 2、Large Screen Display: The CO2 detector has a large screen that can display power, CO2, temperature and humidity, making it convenient for you to check the air quality at any time. 3、Different Font Colors: Equipped with a large screen, different font colors show different air quality. 400‑800ppm, green is normal. 800‑1800ppm, yellow concentration is slightly highe. More than 1800ppm, red concentration is super high. 4、Rear Vent Function: The rear vents not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. 5、Wide Range of Applications: Air quality monitor CO2 detector is suitable for a wide range of places, can be used in schools, hospitals, restaurants, shopping malls, offices, etc. Specification： Item Type: Air Quality Detector Product Material: ABS, Electronic Components Weight: Approx. 369g / 13.1oz Product Size: Approx. 16x9.2cm / 6.3x3.6in Carbon Dioxide Detection Range: 400-5000ppm Carbon Dioxide Detection Accuracy: 1ppm HCHO Detection Range: 0.005-2mg/M3 TVOC Detection Range: 0.008-2mg/M3 Temperature Measurement Range: 1-70℃ Temperature Measurement Accuracy: 1℃ Humidity Measurement Range: 0%-99%RH Humidity Measurement Accuracy: ±2% 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