Nest Protect looks for fast-burning fires, smouldering fires, and carbon monoxide. It also speaks up when there´s a problem, can be silenced from a phone when you´re home, and sends a phone alert if you´re gone. · · · Get alerts on a phone · · Know what´s happening and where · · Sees the CO you can´t and alerts you to it · · A light in the dark · · Split-Spectrum Sensor · · Hush from the Nest app · · 10-year life span · · Sleep safe and sound