The 7020BSLA (CAT 1036168) is a wire-in, 120 VAC 60 Hz single and/or multiple station photoelectric smoke alarm with integrated 177 candela LED strobe light specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, public housing, dormitories and other multifamily dwellings. Model 7020BSLA complies with ULC STD S531 and ULC STD S526 and meets residential new construction smoke alarm requirements in Ontario. The alarms are inter-connectable with up to 18 devices, of which 12 can be smoke alarms. The BRK 7020BSLA alarms feature a photoelectric smoke sensing chamber, an integrated 177 LED candela strobe light, an 85 dB horn and sealed 3 V lithium battery capable of providing backup power for alarm over 10 year alarm life. The Strobe Light is designed to provide deaf and hard of hearing individuals with a visual warning of a fire. The Smart Strobe has separate flash patterns for smoke/ heat and carbon monoxide dangers (when connected to a First Alert CO alarm). This helps a hearing impaired person better distinguish the danger present. The 177 candela LED strobe flashes at a rate of an average of 60 times a minute. The LED flash is also synchronized so when multiple units installed, strobes can flash in unison.