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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Plug in Carbon Monoxide Alarm

Product ID: 2248752

Details

Alarm
Carbon
Brand
First Alert
Color
White
Item Weight
4.2 Ounces
Operating Humidity
10-95% RH
Power Source
Corded

📏Compact 1.38"x5"x3.4" plug-in design

🔊Loud 85dB alarm for instant alerts

🔋Battery backup for power outage safety

15.00 OMR

Duties & taxes included

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Description

⚠️ Stay plugged in, stay protected—because peace of mind never goes out of style.

SMART SILENCE - One-button test and mute feature silences nuisance alarms without compromising safety.
PLUG PROTECT - Simple plug-in design fits any standard outlet—no tools, no hassle.
TRUSTED LONGEVITY - 7-year limited warranty with end-of-life signal means you’re always covered.
PRECISION DETECTION - Advanced electrochemical sensor ensures the most accurate CO monitoring.
UNINTERRUPTED SAFETY - Battery backup keeps you protected even during power failures.

The First Alert CO606 is a compact, plug-in carbon monoxide detector featuring an advanced electrochemical sensor for precise CO detection. It includes a battery backup to ensure continuous monitoring during power outages and emits a loud 85-decibel alarm to alert you instantly. Designed for easy use with a single test/silence button, it meets UL safety standards and offers a 7-year limited warranty with an end-of-life signal for timely replacement.

Specifications

ASIN	B000ND74XA
Alarm	Carbon Monoxide
Best Sellers Rank	#92 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Carbon Monoxide Detectors
Brand	First Alert
Built-In Media	Alarm, Battery
Color	White
Customer Reviews	4.7 out of 5 stars 22,961 Reviews
Enclosure Material	Plastic
Global Trade Identification Number	00029054000682
Item Dimensions D x W x H	1.38"D x 5"W x 3.4"H
Item Type Name	CO Alarm
Item Weight	4.2 Ounces
Manufacturer	First Alert
Mfr Part Number	FATCO605
Model Number	CO606
Number of Items	1
Operating Humidity	10-95% RH
Power Source	Corded Electric
Product Dimensions	1.38"D x 5"W x 3.4"H
Product Style	Plug in Alarm with Battery Backup
Sensor Type	Electrochemical
Style	Plug in Alarm with Battery Backup
UPC	029054000682
Unit Count	1.0 Count
Upper Temperature Rating	105 Degrees Fahrenheit

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