The alarm sound pattern is pulsed three alarm beeps. This continues until the CO eliminated. The red LED will flash once every one second while in alarm mode.

One chirp every 40 seconds is an indicaton that the battery is low(need replacement).

Test button to teat the units electronics and verifies proper unit operation Red LED light flashing once every 40 seconds to indicate normal operation mode.

One chirp every 40 seconds is an indication that the battery is low9need replace ment)

Test button to teat the units electronics and verifies proper unit operation Red LED light flashing once every 40 seconds to indicate normal operation mode