1) Real time monitoring carbon monocide level with range from 0-1000ppm
2)Semiconductor sensor with 5 years long lifetime 
3)No LCD or LCD type can be selectable
4)Temerarure and humidity detection and display optional
5)Preset the first and the second alarm levels for measured carbon monoxide with a buzzer alarm
6)Provide 1x on/off relay output to control the relay action
7)Modbus RS-485 communication interface optional,15KV antistatic protection ,independent address setup
8)Three-color (gree/yellow/red)LCD backlit indicating three carbon monoxide levels
9)High quality technics and elegant appearance,best choice for home and office
10)220VAC or 24VAC/VDC power selectable;power adaptoe available;desktop and wall mounting type available
11)CE-approval.