The Compliance Pack contains 3 x smoke alarms. Danish by design, the aesthetically pleasing CAVIUS smoke alarms are not only the world's smallest, they also contain advanced technology and intelligent features. The alarm will make an optical reading every 8 seconds ensuring it is always on the lookout for smoke. Photoelectric sensor, as recommend by the NZ Fire and Emergency Service. Two installation options: recessed (19mm profile) or standard mounting base.