I left 1 star for the actual review of the KZ bluetooth adaptor I got instead of the review of the shipping speed and the cocksucker shop had the nerve to say I should try it out in an area with less interference (lol abandoned road at night while jogging not enough???). It was constantly dropping out because the cocksucker KZ actually bundled a system with two separate bluetooth adaptor devices that kept trying to work over each other instead of a proper unified one. It didn't matter which side I connected first, it just kept interfering and dropping out. The KZ earphones themselves are fucking good though. I've got 3 of those and will probably keep buying more.