- Loud 85 decible alarm;

- Permanent carbon monoxide sensor with self-diagnostic feature;

- The alarm sound pattern is four short alarm beeps. The red LED will flash while in alarm mode;

- One 'chirp' every 30 seconds with red LED flashes once is an indication that the battery is low(need replacement)(green LED still flashes once every 30 seconds);

- Test/Reset button to test the unit electronics and verifies proper unit operation and reset the unit during Co alarm;

- Alarm memory feature: If the unit ever alarms, pressing the button, the last alarm level will be indicated on the LCD;

- Green and red LED lights that indicate normal operation and alarm staus;

- The unit will sound 'chirp' and all LEDs flash once as power up;

- 3 digits LCD is equipped with blue backlight. 0-999ppm is indicated on LCD when measured. 'Lb' indicates low battery(need replacement) and 'Err' indicates malfunction(need fix). The LCD will be lit as test/reset button pressed and as CO concentration exceeds 30ppm;

- Three minutes after the batteries installed, the unit starts to detect CO.