US Plug,CO2 Meter Controller Detector Air Quality Dual-Output with NDIR Sensor Human Plant Mode for Greenhouse Etc 1. Automatic day/night detection feature 2. Traceable chart with adjustable time scales 3. Dual-channel, low-drift NDIR CO2 sensor 4. Green backlight for enhanced visibility 5. Simple calibration process for CO2, temperature, and humidity 6. Audible alarm for high CO2 levels 7. Temperature and humidity monitoring 8. Dual-control function for fan and CO2 device in Plant Mode 9. Comes with a remote CO2 sensor 10. Human and Plant mode function 11. Switchable temperature unit (°C/°F) Please note: There is a slight color difference or discrepancy in kind, it does not affect the use, please do not mind! This controller is precise and user-friendly and features automatic day/night detection, a dual-channel low-drift NDIR CO2 sensor, and a green backlight for clear visibility. Easily monitor data with adjustable time scales and stay safe with an audible high CO2 alarm. It also has NDIR (Non-Dispersive Infrared) Sensor which designed to monitor and control the concentration of carbon dioxide (CO2) in an environment. It is incorporated with temperature and humidity sensors, providing a more comprehensive environmental monitoring solution for you. Colour:Photo Color Material:plastic Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Voltage: AC100-240V Package Contents: 1 x Co2 Controller 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.