Nest Protect Wired Smoke and Carbon Monoxide Alarm;

Phone alerts include: Low-battery Smoke & Carbon monoxide Sensor failure Split-Spectrum Sensor Voice alarms with custom location Nest App App Silence Detects carbon monoxide 10-year product lifetime Safety Checkup Heads-Up alerts Sound Check Self Test Nightly Promise Pathlight Steam Check Wireless Interconnect Safety History What To Do Home Report Emergency clip record with Nest Cam Nest Protect Wired: Three long-life backup batteries (Energizer Ultimate Lithium "L91" AA)