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We semi-firmly believe this doohickey is an infrared encoder made to mate with a ¾” dia. motor shaft to sense position. 32 steps per revolution, it measures 2” x 1-3/4” x 5/8” with (3) mounting wings and 4-lead 7-1/2” long wiring harness and an Amphenol connector. No specs, but it was made right here in the US of A. It’s labeled QUESTEK RD 9U010.