My iPhone 12 Pro wouldn?t charge , it started charging ( slowly but stop ) but work for my husband 11 iphone The usb cable is the charger so you can use any usb power adapters and walk charge it. Consequently the metal assembly comes into direct contact with and rests on the door instead of on the cushion. Comes in a nice charging case which is usb chargeable. You get a second or two where the audio drops out while this kicks in. In resume: TO AVOID even at 2 bucks! perfect fit! I initially bought this waist trainer in Medium but unfortunately it was too small so I returned it and ordered a large (super easy to return btw). Very unique look. I shot them an email from their Youtube page and they work with me to try and remedy the problem.