I don't know how to put it but when my wife tried to use this cable on her Samsung S8+, the USB-C cable failed to connect - it kept resetting the charging aspect. When I connected it to my S8+ it connected cleanly. I compared the ends of the USB-C to other cables we have and they are slightly shorter. I tried all three cables on their phone with the same result. I'm leaving them because they seem to work on all of our other USB-C devices.