BEST OVERALL: Kidde ... a 9-volt battery in the front of the unit. Since it is hardwired, it can interconnect with up to 24 other devices, including other smoke, carbon monoxide, or heat detectors.

Gwinnett County firefighters are teaming up with smoke and carbon monoxide alarm manufacturer Kidde to make sure families are ...

Learn more The best smoke detectors ... Best ionization: Kidde RF-SM-DC - See at Amazon Best overall The X-Sense SC01 features a 10-year lithium battery, carbon monoxide detector, and a color ...