5mm cable with in line controller and a mic for basic functions (such as volume and track access). Hard to describe. This sandal is perfect! I bought these slippers because my feet ache. Also, I had a pair like these in high school. NO EXCERCISE BALLS included. The straps sort of auto adjust to your feet. The earbuds themselves fit perfectly into your ears and are very comfortable. Hope these hold up to last for awhile. Great quality and like so much my husband is ordering a mens Acorn slipper.