“While our First Alert smoke alarms are designed to be ... you should replace the battery at least once a year. If the alarm chirps, replace the battery sooner. “All smoke alarms must be ...

The new First Alert Smart Smoke & CO Alarms will cost $129.99 and will be available in hardwired or battery-powered options ... may need to replace theirs soon. Park says they were designed ...

If you have an area where you want to add one, install a battery-operated unit, which is about $15. To replace your direct-wired smoke detector, first turn off the power at the main panel.