The perfect alarm for peace of mind This combination alarm has a voice warning system TELLING you if smoke or carbon monoxide has been detected Combined Smoke & Carbon Monoxide Protection p added safety in a single unit Extra sensitive Carbon Monoxide detection stateoftheart electrochemical technology Ionisation Technology for smoke detection Combined Smoke & Carbon Monoxide Protection p added safety in a single unit Loud Voice Alarm eliminates confusion p indicates whether fire or CO danger Extra sensitive Carbon Monoxide detection stateoftheart electrochemical technology Ionisation Technology for smoke detection Test Reset button means that you can verify alarm operation Low battery indicator p voice announces Low Battery & red LED flashes Easy installation 5 year warranty CE marked Ionisation alarms are quicker at detecting fast flaming fires Kidde recommends for maximum protection that both ionisation & photoelectric smoke alarms be installed