How determine the use of motion detector and beam detector

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Model: LMABT, FABT, LMABE, FABE, CXABM, FABM, LMS3D, LMS3

There are so many different motion detectors in the market because actually different kinds of detector have their only specific applications.

Beam detector is designed for so-called perimeter defense ( can be classified as exterior defense ) mostly while PIR motion detector mostly a kind of interior defense ( that use mostly indoor for a relatively small protected area ).