Feature:

1)MCU control,reliable without false alarming
2)field audio and visible alarming
3)simple installation
4)excellent reliability & high stability
5)self-test fuction,Auto-reset
6)Durable sensor head
7)less affected by other organic solvent
8)high accuracy
9)Low-battery indicator
10)Mal-function indicator
one "chrip" every 30 seconds with green LED being out and "Err" on the LCD
(Note:the LCD will show co actual concentration between 30-999ppm,or just show "999ppm" after exceeding 999ppm.)
11)memory feature:
if the unit ever alarms,pressing the button,green LED flashes and peak co figures on the LCD.
(Note:3 mins preheating to enter into work mode after connecting with battery.)