Cavius alarms used in the UK have third party certification showing compliance. In Europe, domestic smoke alarms must be CE certified and comply to EN14604:2005/AC:2008. Some national quality standard and certification may exist in some countries (i.e. VdS in Germany, NF292 in France…) United States will require UL 217 standard, and Australia AS3786. Never install an alarm without correct certification – it can jeopardize your life.