Usage: Alarming in case of smoke or heat development in living rooms, bedrooms, boiler rooms, etc. This networkable radio smoke and heat detector triggers all other detectors in the network if one alarm is activated. It can be combined with the Olympia alarm systems of the Protect/ProHome series for additional telephone alarms. Features photoelectric sensor technology with a loudness of 85 dB. The heat alarm temperature range is from 54°C to 70°C. It operates on battery power, with a battery life for smoke alarms of up to 1 year and a low battery warning. Suitable for indoor use and designed for ceiling mounting.