0 Stereo. And since the sound tends to always be there at some level, it can be an annoyance (or worse). The product was required to create hanging space and look good in a small bathroom and it did. I put them on the morning of our trip and first fell right in the middle of the security check in. It was as if it was at least a full size or even size-and-a-half larger than the size listed; wearing an extra pair of socks wont even come close to rectifying the issue. However, they changed something about the manufacturing of the plastic housing that makes the deodorant unusable. Size 12 fits nicely no cramping of toes. Would recommend, took less than a minute to install. Ive been very satisfied with these earbuds. I?ve had Chaco sandals before but this time I was looking for a closed toe model.