![]() The SkyBell device uses a PIR sensor (passive infrared sensor), which is an electronic sensor that measures infrared light radiating in the field of view think flood lights or motion detectors for your alarm system.This enhances the accuracy of motion detection, which will improve your overall SkyBell experience. Spherical aberration is a loss of definition in the image arising from the surface geometry of a spherical mirror or lens. This is a flat lens made of a number of concentric rings, to reduce spherical aberration. The motion sensor on the SkyBell HD contains a Fresnel lens.
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