Those include sensors for humidity (to reduce alarms from steamy showers and cooking), room occupancy, and ambient light (for the night-light), as well as carbon monoxide and smoke. Nest employs a ...
On April 3, Nest Labs halted sales of the Nest Protect smoke and CO alarm and deactivated the hush feature, called the Nest Wave, over concerns that the alarm could be unintentionally deactivated.