5 mm audio out jack). By the end of my last shift I was taking turns standing on one foot to give the other a rest, like a flamingo! SO COMFY. This seems to have worked but its only been 24 hours. There are negatives to the pads as well. For my second bike I am just using a battery and the second light. Bonus: the turquoise color is lovely and is easier to find in her purse than the white one was! Setup went flawlessly. They have a velcro closure on each vamp which is handy. 5 jack or USB port.