First Alert’s battery-powered Smoke + Carbon Monoxide Detector is $20 at Amazon (33% off)

$20

Amazon is offering the First Alert Combination Smoke and Carbon Monoxide Detector (SCO5CN) for $19.75 shipped. That’s $10 off the typical rate there and also sets a new low. Going with a battery-operated option means that you can install these anywhere, allowing you add an extra layer of protection wherever you’d like. This is Amazon’s best-selling combo unit and over 1,600 customers have giving it an average rating of 4.3/5 stars.

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The combo unit above runs on two AA batteries. Apply your savings towards an an 8-pack of AmazonBasics AAs for just $5. They have a 10-year shelf life, meaning that you don’t have to worry about them going bad on you any time soon.

First Alert Smoke + Carbon Monoxide Detector features:

• Keep your family safe with this battery operated smoke and carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO levels, even if there’s a power failure
• Features an electrochemical Carbon Monoxide sensing technology as well as a photoelectric sensor that detects the larger particles of a smoldering fire