These things literally auto sync to each other when you take them out of the box at the same time. The Sony?s - Greatly improves over the series 2 version of the headphones. SUMMARYInitially I was pulled in by the appearance of these sneakers thinking I would have an interesting pair to walk the dog and maybe do stationary cycling in at home, but I was not expecting to find the most comfortable running shoes I have ever worn in my life. Awwesome productHad to buy one size bigger but working well. Mir passen sie nicht, meinen Freunden mit Schuhgröße 39 schon :/ Seriously, it is the end-all be-all solution to the problem! I picked up the new version as it made sense to have an extra for my PC and leave the other hooked up to my xbox. I was hesitant to buy these based on all the reviews that said they were too small but I really liked their appearance so I figured I?d give them a try. Now I had ordered the Black Annadel Eirwyn, and this shoes does NOT fit my feet as comfy as my other two Clark wedges. This is work just fine so far.