why does mine chirp intertmittently

If it is a 9 volt battery, it may not be seated correctly. See the video on the first alert website, and be prepared to do some hard pushing to get the 9V battery to engage. I had 3 9V units, and 2 of the 3 seemingly required excessive pressure to get the batteries to engage. When I first thought I had the batteries installed by just closing the door, the unit chirped until I got the batteries shoved on hard.

Will the unit work without a bettery in it?

I'm putting these units into rentals. Will this work without a battery in it? If the battery runs low, the tenants usually take the whole unit down rather than change the battery - rendering the whole concept useless. This is the reason I would like to invest in "plug-in" units. However, somewhere it said it will chirp if battery is missing. Please clarify. I need a unit that will be effective, even without a battery installed.

Does the monitor plug directly into the wall socket or is there an electric cord?

No cord. The alarm plugs in directly to the outlet.

At what level of co does this alarm sound? Thank you for your time.

The following info is verbatim from the instructions that came with the unit: Actuation of the Alarm indicates the presence of carbon monoxide which can kill you. In other words, when our CO Alarm sounds, you must not ignore it! The following is not verbatim but a summary of regulatory requirements. Levels of CO that cause an alarm: at 400 ppm of CO, it must alarm between 4 and 15 minutes; at 150 ppm of CO, it must alarm between 10 and 50 minutes; at 70 ppm of CO, it must alarm between 60 and 120 minutes. The unit is designed not to alarm when expose to a constant level of 30 ppm for 30 days. Hope this has answered your question....from housewife1.

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⚠️ Stay one step ahead—because safety waits for no one!

TRUSTED BRAND - First Alert’s proven quality gives you peace of mind every day.
INSTANT ALERTS - High-decibel audible alarm ensures you never miss a critical CO warning.
COMPACT SLEEK - Modern white design fits seamlessly into any home or office environment.
PRECISION DETECTION - Advanced electrochemical sensor delivers reliable carbon monoxide monitoring.
UNINTERRUPTED SAFETY - Plug-in power with battery backup means your home stays protected even during outages.

The First Alert CO605 is a compact, plug-in carbon monoxide alarm with a battery backup, featuring an electrochemical sensor and a loud audible alarm. Designed for continuous, reliable CO detection, it combines trusted First Alert quality with a sleek, unobtrusive design to keep your home safe 24/7.

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Brand	First Alert
Style	Plug in Alarm with Battery Backup
Power Source	Battery Powered
Colour	white
Product Dimensions	3.5D x 12.7W x 8.6H Centimeters
Item Weight	4.2 Ounces
Alarm	Audible
Upper Temperature Rating	105 Degrees Fahrenheit
Sensor Type	Electrochemical
Global Trade Identification Number	00029054000682
Material	Plastic
Number of Items	1
Manufacturer	FIRST ALERT
UPC	029054000682
Department	Detecters
Item model number	CO605
ASIN	B000ND74XA

First Alert CO605 Plug-In Battery Backup CO Alarm, 1 pack, White

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