A solid option if you're looking for a CO alarm that's simple to install, the 900-0107 (KN-COB-DP-H) carbon monoxide detector from Kidde simply plugs into any electrical outlet. The alarm uses an electrochemical sensor to detect CO buildup. Electrochemical is the most reliable technology, and doesn't falter when faced with temperature or humidity changes. It's a no-frills combination of effective operation, unobtrusive design, and affordable price. This price is for a two-pack of detectors; it's not available as a single unit.

These are fairly basic units, without a lot of bells and whistles, but they do what they're designed to do: monitor for carbon monoxide. This model emits a loud, 85-decibel series of beeps if CO accumulates to dangerous levels. It features a test button and a green LED that lets you know the unit is operating.

The alarm has an alert that sounds after seven years and lets you know when it's nearing the end of its useful life. The Kidde 900-0107 (KN-COB-DP-H) carbon monoxide detector two-pack is covered by a 5-year limited warranty.


Pros: Price, plugs in to outlet
Cons: Fairly basic

Warranty
5 years, limited