The EIB650iRF photoelectric smoke alarm is fitted with a proprietary photoelectric sensor to quickly sense low energy smoke particles. The EIB650iRF is a EIB650iW fitted with EIB600MRF. This photoelectric alarm is sensitive to all domestic fire types but is especially sensitive to smouldering fires. To be ordered with: EIB170RFAU - High Intensity Strobe and vibration pad combo or seperately EIB171RFAU High Intensity Strobe + EIB174 Vibration pad. See further details for this product in the additional files below SUPPLIED WITH 3V LITHIUM-ION BATTERY