Aico EI146 mains powered optical smoke alarm c/w alkaline battery back up.Hard wired & interlinkable up to 12 units.Comes complete with an EASI-FIT base.The unit can also be mixed with heat & CO alarms, call points, alarm locator switch's & can be converted to wireless interconnection with a RadioLINK base.Complies with BS EN 14604-2005.More responsive to slow smouldering fires & reduces false alarms.