My next favorite feature is the included magnets so the earbud wont fall off your neck while running. I was a bit too excited at first to just build the thing that in hindsight I could have designed the compartments a bit better. VERY disappointing, especially for the money spent! Despite having thirteen buttons, every one is unique and distinct in its usage, leading to little confusion about which button youre pressing. They glowed red. But i cant deny its so gorgeous, I almost want to keep it but dont want something I will not have a fun time using. Usually a double click advances to the next song. I buy from Amazon all the time, but this was a knucklehead quality control miss! His one complaint is that the mounts on the back of the rack are not centered properly. A breath of fresh air after the recommended unit by PB that was a POS.