Optical Smoke Alarm With Light

3 year replaceable batteries |Designed to make protecting your home simple, with easy install and rigorous testing by independent parties, such as BSI Kitemark, to ensure quality and longevity.|Escape light - The extra bright light beam and loud, clear alarm will ensure you are alerted to danger and are guided to safety. This alarm is perfect for landings, hallways and bedrooms.|Optical sensing - a fast response to slow burning fires.|Testing made simple with large self-test button. |Sleep easy function silence low battery warnings for 8 hours