Maybe this will be the dumb question of the day, but what is purpose of the black rubber 2-1/2" strap with loops on the ends that came with my phone? Nothing I can find mentioned in the manual or on the website. The QR code and Google images is no help, and all in all the unboxing vids on YouTube they ignore it. I'm assuming it's some kind of cord leash, but it doesn't make sense why I would need to attach the headphone jack to the USB-C cord.