4A which is nice but the TOTAL max for the USB ports is 3. I guess I forgot about the style and bought the "Pisces" in white until this year when I decided to re-visit the slide in black. While the equipment itself looks like it will be solid once you get it on, installing this set of foot packs and fit kit is a nightmare, thus the one-star rating. And if you dont like it, maybe you dont understand it What I don’t like about them is they wobble loose during exercise and when I try to reposition them they pause and/or turn off and completely disconnect. These are good-looking shoes, well made, super comfortable. Its loud enough to hear people talk (podcasts, news) well in the shower. Not a big deal but The bike rack uses a bolt and nut for the hitchpin wit makes it wobble less. Wore it all week in Mexico in and out of the pool. I washed it in a cold rinse cycle and then a normal cold wash cycle (for delicates).