Dual Ionisation technology - Detects flaming fires quicker Loud 85db alarm Beeping signal when battery needs replacing Test button checks alarm function Ideal for bedroom and living areas Easy to install Includes 9V battery & fixings 5 year limited warranty May come clamshell or boxed Stock may come in yellow/black box (BRK/Dicon) or red/white box (First Alert) BSEN14604 Approved CE Approved