This cable is 100% functional on iPhone 5s: loading and synchronization. He is recognized as genuine. However, this is undoubtedly a forgery. Proof, the plastic coating of the USB portion is not adhered to the metal part and therefore can slide along the cable. Difficult then unplug the cable end up with a piece of plastic in hand. Apart from this defect could be corrected by an adhesive development, production has very good air. (Witness the quality of the USB cable under the plastic.)