This unit works great. I bought 4 of these in total and had no problem powering them from the Raspberry Pi 3 B that I had connected to them. I'm ticking 1 star because they're only 10/100Mbps. It doesn't matter for Pi other than the new Raspberry Pi3B+ that I'm upgrading my cluster to. 3B+ now supports connection speeds in excess of 100Mbps, meaning these adapters will be your bandwidth bottleneck. The frustration of having to replace these blocks just because the manufacturer lowered the price and didn't want to fill all 4 ethernet pairs makes me deduct the star. The product description only mentions this once and towards the end of their specifications. so this is a bit misleading.
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