Real time detect CO2 concentration,Day/Night mode

1 Design for real time monitoring room carbon dioxide level 
2 NDIR infrared CO2 sensor inside with special Self Calibration System. It makes the CO2 measurement more accurate and more reliable in use.
3 More than 10 years lifetime of CO2 sensor 
4 Temperature and humidity monitoring
5 Three-color (green/yellow/red) LCD backlit indicating ventilation optimal/moderate/poor based on the CO2 measurement
6 Two alarm ways: buzzer alarm and backlight colours switch 
7 Provide optional 1xrelay output to control a ventilator
8 Easy touch button for operation 
9 Optional RS485 communication interface, 15 KV antistatic protection, individual IP address
10 High quality technics and elegant appearance, best choice for home and office
11 220VAC or 24VAC/VDC power selectable; power adaptor available; desktop and wall mounting type available
12 EU standard and CE-approval