Regardless of all the techy stuff, I love these sandals because they are the most comfortable sandals I have ever bought. The device can connect to multiple devices at the same time, I can use one earbud to listen to music, and the other earphone can be ready to answer the phone. Not happy about the wasted $5 or the out of way trip to USP store. Im a little disappointed because I wanted it to match my black/grey golf shoes but will probably keep because itll still look nice while on the course. We had to carry it up 2 flights of stairs. $44 for a pair of kid crocs is really steep! If a product simply fails to work, and completely fails to work, I dont think it deserves a good rating. I am very disappointed in this product. I have about six or seven pairs of Birkenstock sandals, but these are now my favourites. I saw a couple of Amazon reviews that griped about abnormal wear but Ive had these a few weeks and like them just like the previous dozen I bought from Skechers online or at their local store.