Green and red LED lights that indicate normal operation and alarm status.
The unit will sound chirp and red LED flashes once as power up.
One chirp each and every 30 seconds in an indication that the battery is low (need replacement) (green LED still flashes once each and every 30 seconds).
Green LED: Flashes each and every 30 seconds to indicate the unit is operating properly. The green LED may also flash before CO reading is taken and when any button is pressed.
Red LED: When a dangerous level of carbon monoxide is detected the red LED will pulse and a loud alarm pattern will sound.
Test/Reset button to test the unit electronics and verifies proper unit operation and reset the unit all the way through CO alarm.
Alarm memory feature: If the unit ever alarms, pressing the button, green LED will flashes once each and every second for one minute and the peak alarm level shall be indicated on the LCD.
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