* Power supply: 9V DC battery
* "Battery missing" lockout
* Low battery alarm
* High sensitivity
* Humidity range: 15% to 95% RH
* Operating temperature: -10ºC to +50ºC
* Built-in sounder to give a minimum sound output of 85dB at 3m
* Senses smoke using the light scatter principle
* Quick response to visible smoldering smoke
* Test button simulates smoke – use to check performance