Kidde Smoke & Carbon Monoxide Detector, Hardwired, Interconnect Combination Smoke & CO Alarm with Battery Backup, Voice AlertThe leading cause of accidental poisoning deaths in North America, Carbon Monoxide is odorless, tasteless and invisible. It is a silent killer. Kidde CO alarms include the most accurate sensing technology available, the patented Nighthawk electrochemical sensor. This unit combines a Carbon Monoxide and Ionization Smoke Alarm, providing two important safety devices in a single unit. This alarm includes a voice warning system that announces "Fire, Carbon Monoxide, Low Battery or Smart Hush Activation." The voice alarm eliminates any confusion and clearly warns you and your family of a smoke or carbon monoxide danger, or if your battery is in need of replacement. This unit is hardwired and will work with many interconnected systems. This combination alarm has battery backup, protecting you and your family even during a power outage when many incidences occur. Install at least one CO alarm on every floor and in sleeping areas. Make sure CO and Smoke alarms are at least 15 feet away from cooking or heating appliances to prevent false alarms. Replace CO alarms every 5 to 7 years to benefit from the latest technology upgrades. Ionization sensing alarms may detect invisible fire particles associated with fast flaming fires sooner than Photoelectric alarms. Studies show both types will effectively detect either type of fire. For optimal protection, install both smoke alarm technologies in your home.The Kidde Smoke & Carbon Monoxide Detector, Hardwired Interconnect Combination Smoke & CO Alarm with Battery Backup & Voice Alert, model KN-COSM-IBA, is an AC-wired, ionization alarm operates on a 120VAC power source with 2-AA battery backup. Using ionization sensor technology, the wired smoke alarm detects invisible fire particles. The combination CO detector provides continuous protection from carbon monoxide, even during power outages. A red LED will flash & be accompanied by 3 long alarm beeps followed by a verbal warning that warns of fire, carbon monoxide, & low battery. The Hush feature silences the fire alarm for approximately 9 minutes. The green LED on the alarm will flash every 2 seconds when Hush is activated and canceled. A maximum of 24 Kidde devices can be interconnected in a multiple station arrangement, but cannot exceed the NFPA (National Fire Protection Association) limit of 18 initiation devices, of which 12 can be smoke alarms. With 18 initiating devices (smoke, heat, CO, etc.), interconnected, it is still possible to interconnect 6 strobe lights and or relay modules. UL Certified with a 10-year limited warranty. Meets requirements of UL 2034, UL217, NFPA72, The State of California Fire Marshall, NFPA 101, FHA, & HUD.Kidde Smoke Detector, Hardwired with Battery Backup & Interconnect, Battery IncludedThe Kidde Smoke Detector, Hardwired with Battery Backup & Interconnect, Battery Included, model P12040, is an AC/DC powered, photoelectric smoke alarm. The hardwired smoke detector operates on a 120V power source with a 9-volt alkaline battery backup (battery included) so the fire alarm keeps working in the event of a power failure. Using photoelectric sensing technology, the wired smoke alarm detects visible fire particles (associated with smoldering fires) sooner than ionization alarms; Kidde strongly recommends installing both photoelectric and ionization alarms to ensure maximum detection of the various types of fire that can occur within the home. Install one Kidde smoke detector on every level of your home, outside each sleeping area, and inside every bedroom.Two LED lights indicate the smoke alarm's status. A red LED indicates the mode of operation: Standby Mode – flashes every 40 seconds to indicate the smoke alarm is operating properly, and Alarm Mode – flashes once each second to indicate that the smoke alarm senses products of combustion. A green LED indicates that the smoke detector has AC power. The Test/Hush button can be used to test the u¬¬nit's circuitry and battery function, while pressing the button when the alarm is sounding silences it for approximately 7 minutes during nuisance alarms. The Kidde hardwired smoke detector can be interconnected with other Kidde alarms to alert you and your family quickly in an emergency. A maximum of 24 Kidde devices can be interconnected in a multiple station arrangement but cannot exceed the NFPA (National Fire Protection Association) limit of 18 initiation devices, of which 12 can be smoke alarms. With 18 initiating devices (smoke, heat, CO, etc.), interconnected, it is still possible to interconnect 6 strobe lights and or relay modules. UL Certified with a 10-year limited warranty. Meets requirements of UL217, NFPA72, The State of California Fire Marshal, NFPA 101, FHA, and HUD.