HOME SAFETY SET: This essential 2-pack provides vital protection against carbon monoxide (CO) and fire risks in your home. The CO detector alerts you to invisible gas dangers, while the optical smoke alarm responds quickly to slow, smouldering fires. EARLY WARNING SMOKE DETECTOR: The Toast Proof Smoke Alarm is less prone to false alarms. The optical smoke sensing chamber works by 'seeing' smoke as it enters the alarm, perfect for slow burning fires with thick white smoke. ENHANCED CO SENSING: Designed with intelligent sensing technology, the CO alarm's high sensitivity mode activates when it predicts CO levels will increase to or above 180ppm, providing a quicker alert to ventilate. REPLACEABLE BATTERIES: The SB1-R smoke detector includes a 1-year replaceable battery and a 3 year warranty. The FA3313 Fire Angel CO alarm comes with 2 x 1 year replaceable AA batteries and a 5 year warranty. ADDITIONAL FEATURES: You can mute the FA3313's low battery warning for 8 hours by pressing the test button whilst the amber light continues to flash. For a false smoke alarm, hold the SB1-R test button for 5 seconds to silence it for 8 minutes. SAFETY ASSURED: The FA3313 CO monitor holds CE and UKCA marks and is certified to BS EN 50291-1:2018 and BS EN 50291-2:2019. The SB1-R alarm holds both CE and UKCA marks and is certified to BS EN 14604:2005. Suitable for homes in England and Wales. FIREANGEL HOME PROTECTION: In addition to our CO and smoke alarms for home use, we offer a wide range of other safety products designed to protect you and your family. Choose from smart and wireless devices, as well as kitchen heat alarms., Weight: 0.28219169536 pounds, Manufacturer: FireAngel