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: ABS Power Input: AC100-300V CO2 Measuring Range: 0-9999ppm CO2 Display Resolution: 1ppm CO2 Accuracy: ±50ppm CO2 Repeatability: 10ppm CO2 Temp. Dependence: ±1% of reading per or ±2ppm per , whichever is greater, referenced to 25 Pressure Dependence: Support Response Time: < 1min Warm-up Time: < 20s Temperature Measuring Range: 0-50 (32-122) Temperature Display Resolution: 0.1 (0.1) Temperature Accuracy: ±0.5 (±1) Response Time: < 10min RH Range: 0-99% RH Accuracy: ±3% RH Resolution: 0.1% Control Unit Size: 164 * 147 * 47mm / 6.47* 5.79 * 1.85in Sensor Unit Size: 105 * 63 * 28mm / 4.13 * 2.48 * 1.10in Item Weight: 1025g / 2.26lb (include cables) Package Weight: 1346g / 2.97lb Package Size: 24.5 * 18.5 * 10.8cm / 9.65 * 7.28 * 4.25in Package List: 1 * Control Unit 1 * Sensor Unit 1 * S Hook 3 * Cable 4 * Screw 4 * Drywall Anchors