Highly polished PIR lens type SP-50W by Aleph-Unicorn. This is a ceiling mount round 5.5" diameter IR passing diffused dome which covers a wide angle PIR lens. It was made by Aleph/Unicorn and the lens is mounted so it can be swiveled in different positions. No electronics - just the ceiling dome, mounting base and highly polished 2.7" long X 2.5" tall X 1.5" diameter lens. Brand new in factory box.
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