Features:Multifunction CO2 Monitor & Controller: it can detect CO2 concentration, temperature and humidity in the current environment, and realize the automatic control of carbon dioxide concentration.High-precision Split-Type Probe Sensor: high sensitive external probe sensor for quickly and accurately measurement of carbon dioxide content.Large Colored Screen: 3.8-inch screen display the current values in real time, and it has the human mode and plant mode to be switched from.Human Mode: if the set alarm value is exceeded, the instrument will automatically supply power to the exhaust fan for ventilation and beep sound-light alarm. Suitable for hospitals, offices, schools, stations, commercial buildings, etc.Plant Mode: when the set value is exceeded, the relay output will be turned off; and the relay output will be turned on automatically when it decrease to the preset low value. Suitable for greenhouse, agricultural, hydroponic flower industry, mushroom farm, etc.Easy to Install: the device with simple but stylish appearance, package includes the accessories for wall mounted installation.Specifications:Plug: EU / US (Optional)Material: ABSPower Input: AC100-300VCO2 Measuring Range: 0-9999ppmCO2 Display Resolution: 1ppmCO2 Accuracy: 50ppmCO2 Repeatability: 10ppmCO2 Temp. Dependence: 1% of reading per or 2ppm per , whichever is greater, referenced to 25Pressure Dependence: SupportResponse Time: Package List:1 * Control Unit1 * Sensor Unit1 * S Hook3 * Cable4 * Screw4 * Drywall Anchors