A battery powered optical smoke alarm that has a 10 year life span, and offers you 24/7 around the clock monitoring of the air to detect the presence of smoke. Battery powered optical smoke alarm, ideal for detecting smoke from smouldering fires Sealed in high capacity lithium battery that provides a 10 year product life span 24/7 Continuous monitoring of the air for the presence of smoke, with hush function to silence false alarms Test and false alarm functions as an easy way to ensure the alarm is working properly Easy installation and an ideal and convenient solution for properties where it is difficult to run cables Alarm volume: 85dB(A)@3m, loud enough to alert users while protecting your hearing Suitable for ceiling or wall mounting UKCA and CE Certified