Samsung SMM-15FDQ - Manual (Page 16)

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3) PIR Camera composition
① Lens
It has a focal length of 3.8mm and makes it possible for you to observe a relatively wide
area.
➁ Speaker
It outputs the sound signal which was transfered from the monitor.
➂ Fresnel Lens
An infrared focusing lens for increasing the sensitivity of the built-in PIR sensor.
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