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The attached image shows both the incorrect and correct assembly of a logger coupler to the BASE-U-4 (Optic Base station) and the U-DTW-1 (Waterproof Shuttle).
Attached please find an image that shows the location of optic LEDs in Pendant (UA-series) loggers. All Pendant optics are located in the same location on all models.
A few years back, Apple removed traditional USB ports and went to something called USB-C. This makes everything incompatible, including HDMI & Ethernet cables.