It’s available on Amazon, with a regular price of $28, and we found it on sale.Next is the First Alert carbon monoxide detector, another popular option. This model comes with a built-in lithium ...

First Alert BRK 7030BSL - See at Amazon Best overall The X-Sense SC01 features a 10-year lithium battery, carbon monoxide detector, and a color-changing LED to let you know its current status.