I had to fiddle around and it's a bunch of worms as many of us know only too well. did a great job with the receiver on one end and two people labeled wires, tested many cables for continuity and as always found two dogs, replaced them, connected and worked so the product did an excellent job. I've used much cheaper ones and am often unsure if the block or wire is defective, so many get thrown away, as long as it's reliable I keep it in my tool box. recommended.
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