Beeping or chirping smoke detectors are beyond annoying. Usually, a chirp every 30 to 60 seconds just indicates a low battery ...

However, for optimal performance, it's important to regularly test and replace the smoke detector 9V battery as needed to ensure reliable operation and uninterrupted protection against fire hazards.

Nest's smoke detectors change colors when the batteries need to be changed, and give you nightly audio updates about the state of your home. "It lets you know you're being watched to keep you safe ...

which is much better than the mystery squeal that comes from most smoke detectors when the battery is dead. This is the second product from Fadell and Nest. The first product was the Nest ...