Negative Positive
Title: Worked great, but can't be chained on a Mac.
Review: These worked great, and were invaluable for my application. Connected to a Windows PC, I was able to connect five in a chain, getting 80 ft. of extension, which was great. On my Mac (an iMac), however, I was only able to use one extension cable; when I chained two my device was no longer recognized by the computer.
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