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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Description

🚨 Stay one step ahead—breathe easy with First Alert CO605!

INSTANT CONTROL - One-button test and mute for quick, hassle-free management
EFFORTLESS SETUP - Plug directly into any standard outlet—no tools or mounting needed
PRECISION DETECTION - Advanced electrochemical sensor ensures the most accurate CO readings
TRUSTED RELIABILITY - UL certified with a 7-year limited warranty for peace of mind
UNINTERRUPTED SAFETY - Battery backup keeps you protected even during power failures

The First Alert CO605 is a plug-in carbon monoxide detector featuring an electrochemical sensor for superior accuracy, a battery backup to maintain protection during outages, and a user-friendly one-button test and mute function. UL certified and backed by a 7-year limited warranty, it offers reliable, hassle-free safety for your home.

Specifications

Brand	First Alert
Style	Plug in Alarm with Battery Backup
Power Source	Corded Electric
Color	White
Product Dimensions	1.38"D x 5"W x 3.4"H
Item Weight	4.2 Ounces
Alarm	Carbon Monoxide
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
Part Number	FATCO605
Item Weight	4.2 ounces
Item model number	CO605
Batteries	1 9V batteries required. (included)
Is Discontinued By Manufacturer	No
Size	1-Pack
Pattern	Alarm
Voltage	120 Volts
Item Package Quantity	1
Number Of Pieces	1
Included Components	Alarm, Battery
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Warranty Description	7 Years Limited

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