First Alert BRK SCO2B Smoke and Carbon Monoxide (CO) Detector with 9V Battery , White

Separate smoke and co detects both dangers and eliminates the need for two separate alarms Electrochemical co sensor is the most accurate technology available Latching alarm indicator remembers which unit initiated an alarm Separate Smoke and CO detects both dangers and eliminates the need for two separate alarms Electrochemical CO Sensor is the most accurate technology available Latching Alarm Indicator Remembers Which Unit Initiated an Alarm End of Life Signal Provides Audible Notice When Alarm Needs to be Replaced Two Locking Features Pins Lock Battery Drawer and/or Alarm to Base It can ship within the US except New York and California Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety