A complete motion sensor alarm system has a few main components. The first is a motion detector, which is the most outwardly evident part of it (that’s why the whole motion sensor alarm system is sometimes only known as a motion detector). This motion detector is generally composed of a...
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Or, a transducer such as a speaker (which may be one of the output devices 208) so that the owner can press a switch which will cause a loud siren sound (or an ultrasonic signal) to be emitted, to scare off potential intruders, or annoying animals. Or, a microphone, so that the ...