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Our Top Choice

Nest Protect 2nd Gen Smoke + Carbon Monoxide Alarm, Battery

Pros: A very accurate carbon monoxide and smoke detector in one unit; will send alerts to your phone if you're not home.

Cons: Expensive, but you are paying for high quality technology that interfaces with your phone.

Summary: Great alert system which syncs well with mobile devices so you're always aware of what's going on in your home. If you want the best, this is the one to get.
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Tough, Waterproof, Made in USA: Carbon Monoxide Te...

Pros: Great unit that is portable, so you can take it on trips and sleep safely in hotels, etc.

Cons: Very expensive and is battery power only.

Summary: If you need a portable unit, this is a rugged detector that works very well. It costs more than permanent, standalone unit, though.
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X-Sense CO03M Battery-Operated Home Carbon Monoxid...

Pros: Bright, backlit display and perhaps the loudest alarm on the market.

Cons: Battery powered only.

Summary: Very accurate and the alarm is loud enough to wake the dead, but unit is battery powered only.
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Kidde KN-COPP-B-LPM Battery-Operated Carbon Monoxi...

Pros: Easy to read; easy to use; loud alarm; loud "battery replace" warning.

Cons: Battery powered only and batteries only last a year in this unit.

Summary: A safe, reliable detector that won't break the bank. It's really hard to go wrong with this one.
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First Alert CO615 Dual Power Carbon Monoxide Plug-...

Pros: Easy to use and virtually fool proof -- plugs into outlet and it has a battery backup. Very loud warning buzzer.

Cons: Hard to find peak carbon monoxide levels and that is information you might want to know.

Summary: Great unit and you have the peace of mind of knowing it plugs into a wall and has battery backup.