Harbor Freight Tools


Carbon Monoxide Alarm

Protect yourself and your family from invisible, odorless carbon monoxide

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FIRST ALERT CO400 at $26.99 Save 26%

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The FIRST ALERT Carbon Monoxide Alarm uses a specialized carbon monoxide sensor to accurately measure and alert you to deadly carbon monoxide build-up. This battery powered unit can be mounted anywhere, even when there is no electrical source available. The sensor unit lasts up to 5 years with normal use. When dangerous carbon monoxide levels are detected a loud 85 dB alarm alerts you.

  • Electrochemical carbon monoxide sensor is the most accurate technology available
  • Battery-operated design works almost anywhere - even during power outages
  • Loud 85 dB alarm alerts you to elevated levels of carbon monoxide
  • Single test/silence button for simple operation

Important Information

  • Uses one 9V battery, included.

Battery(s) Required
one 9V
Battery(s) Included
Product Height
5 in.
Product Length
3.4 in.
Product Weight
0.7 lb.
Product Width
1.5 in.
Shipping Weight
0.45 lb.
Sound rating (dB)
85 dB
Note: Specifications are approximate and subject to change

We guarantee this product to be free from defects in materials and workmanship 5 years from the date of purchase. Limitations apply.