Apollo 55000-600APO Apollo XP95 Optical Smoke DetectorThe Apollo XP95 range of devices can be used with any addressable system using Apollo protocol. The 55000 600APO Optical Smoke Detector works using the light scatter principle and is ideal for applications where quick detection of fire is required. Features Apollo 55000 600APO Quick detection of fire Well suited for bedrooms and escape routes Unaffected by the wind or atmospheric pressure Simple to address using xpert base card Easy to see LED