I think the supplied cables are directional and according to a post from the manufacturer on the Amazon website, the HIDIZS logo should go into the computer and the blank cable end should go into the S9 unit. Counterintuitive if you ask me but on my MacBook Pro, it worked in the correct orientation. But still not working on my iPhone. I posted a question on the Amazon website and I was told to use the HIDIZS Lightning to USB-C cable which was an additional $24 USD and, unfortunately, out of stock. I ordered from another overseas website but it will be awhile since it will arrive. Not the product I had hoped for and not sure I've made the right decision vs. using the $9 Apple Lightning to 3.5 mm dongle.