Modern: Non-dispersive infrared is used as the CO2 gas sensor/temperature and humidity sensor. 3-in-1: Detects CO2, temperature and humidity. Indoor CO2 Detector: Get an indoor CO2 detector for your home. Accurate: Stable performance, strong anti-interference ability, low consumption and long service life. Accurately detect carbon dioxide. Visible: Easy to ready large screen that clearly displays power, CO2, temperature and humidity. Safe: Range Of Application: 400~5000PPM. Indoor Co2 Detector | Living Social | Living Social