Sprint is only word for marketing by JBL ...Each n every time after doing 3 km run when your body gets stared to sweating same time sound of right ear inversly start responding...after some time you can able to hear voice from one side only..so stay away runners from this product.

Worried about wire how long it will last

Nine product 👍👍👍👍👍👍

Awesome stuff 😎 ....