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Therefore it is best used to detect smoke from fast flaming materials like paper and wood. It is also cheaper to manufacture. Compared to photoelectric smoke detectors, it consumes less power so a small battery can power it for month and is independent of external wiring. Since ionization type smoke detectors can detect particles smaller than smoke particles, they are prone to false alarms. Ionic smoke detectors use a radioactive isotope americium 241, and rules on proper disposal vary in each region. Some European countries have banned ionic smoke detectors.

 

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In some implementations, the smart alarm system 122 may also be set to an “armed” mode, such that detection of a trigger condition or event causes the alarm to be sounded unless a disarming action is performed. In some implementations, the smart home environment 100 includes one or more intelligent, multi sensing, network connected wall switches 108 hereinafter referred to as “smart wall switches 108”, along with one or more intelligent, multi sensing, network connected wall plug interfaces 110 hereinafter referred to as “smart wall plugs 110”. The smart wall switches 108 may detect ambient lighting conditions, detect room occupancy states, and control a power and/or dim state of one or more lights. In some instances, smart wall switches 108 may also control a power state or speed of a fan, such as a ceiling fan. The smart wall plugs 110 may detect occupancy of a room or enclosure and control supply of power to one or more wall plugs e. g.