120V Hardwire, Ion Smoke/CO combo w/ battery backup

? Zero Waste, No Eco Fees
? Intelligent Ionization Sensing Technology
? Advanced Electrochemical CO sensor
? 9 volt Battery Back-up
? Two Latching features ? Alarm latch and Low Battery latch
? End of Life signal (CO)
? Two Silence Features ? Silence low battery chirp for up to 8 hours or, temporary silence nuisance alarm conditions
? Perfect Mount - allows for easy alignment of alarm
? Interconnectable-up to 18 devices, of which 12 can be smoke alarms (iniaiting)