HDWD SMK ALRM W/BB-UP18PK *Power Type: Hard-Wired with Battery Back-up *Sensor Type: Ionization *Product Type: Smoke Alarm *Number in Package: 18 pk *ETL Listed: Yes *Packaging Type: Clamshell *UL Listed: Yes *Detects Carbon Monoxide: No *Test and or Reset Button: Yes *For B2B: sold as a case; cannot be sold separately