The heat detector triggers an alarm as soon as the ambient temperature reaches more than 54°C. This allows you to protect your kitchen, garage, attic, boiler room, laundry room, flat, house, holiday home, etc. from fire. Replaceable 9V battery is included. The heat detector alerts you when you need to replace the battery. The fire detector alerts you to the danger with a sufficiently loud warning tone of 85 dB together with visual signalling (red LED). Easy installation thanks to the wireless design, universal design and test/mute button make your life easier. Don't worry about your home fire alarm thanks to the 10-year fire alarm with visual-acoustic signalling and 10-year service life.