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

? Zero Waste, No Eco Fees
? Optipath 360 Photoelectric Smoke Technology
? Advanced Electrochemical CO sensor
? Two AA battery back-up
? Spread Spectrum Horn ? Easier for elderly with normal hearing loss to hear
? Two Latching features ? Alarm latch and Low Battery latch
? Two Silence Features ? Silence low battery chirp for up to 8 hours or, temporary silence nuisance alarm conditions
? End of Life signal (CO)
? Locking Feature
? Interconnectable-up to 18 devices, of which 12 can be smoke alarms (iniaiting)