SMOKE DETECTORS FOR HOME: Keep your home safe with an optical smoke alarm that’s smart and responsive - its advanced sensor “sees” smoke instantly for fast alerts to slow, smouldering fires. 10 YEAR BATTERY INCLUDED: Enjoy a decade of reliable safety, no battery changes needed for the entire lifespan of your Black+Decker smoke alarm. The sealed, tamper proof 10 year lithium battery lasts the life of the alarm. The alarm will indicate when it needs replacing SMART DETECTION: Designed with an advanced optical sensor, the Black+Decker smoke alarm reduces false alarms from cooking smoke - simply install away from kitchens and bathrooms for optimal results. EASY SET UP GUIDE: Insert the alarm onto the activation back base plate and twist the alarm firmly clockwise until you hear a ’CLICK’ then press and HOLD the test button for at least 3 SECONDS until you hear the alarm sound. If the alarm doesn’t sound after 3 seconds, twist the alarm firmly clockwise to try again. SAFETY ASSURED: Trust Black+Decker quality with this Smoke Alarm, certified to BS EN 14604:2005+AC:2008 and fully compliant with CE and UKCA standards. Perfect for home or leisure spaces.