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A recessed motion sensor of the security alarm of my 3D printing class

A recessed motion sensor of the security alarm of my 3D printing class


I initially didn't know what is this, since it have green, orange and red LEDs that turning on and off according to my and other movements.

youtube_FSMl6ahBwD4.jpg youtube_Dl03m_kJNIk.jpg youtube_YzJYnPazYLY.jpg youtube_1ngYezheZ58.jpg

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Album name:dor123 / Off-topic videos
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Date added:Feb 26, 2020
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