Brand Name: BRK *Power Type: Hard-Wired w/Battery Back-Up *Sensor Type: Ionization *Product Type: Smoke and Carbon Monoxide Detector *Number in Package: 6 pk *Packaging Type: Boxed *Warranty: 10 year *Height: 1.9 in. *Width: 5.6 in. *Length: 5.6 in. *Sound Level: 85dB at 10 ft.