Here‘s how to use the BLE caberQU: Plug it in with any USB-C cable on top. Then, take the cable you want to test and plug it in on both sides like the screen shows you to. Now you can see your data transmission speed and charging speed on the first screen. The second screen shows you specifications and on the third screen you can see even more details. Flip through by simply pressing the buttons on the right side of the screen. Happy checking!