Verbatim MFi Lightning to USB Cable (for both Sync & Charge) is avaiable in 3 colours with premium metallic coating. Its length is 120 cm (4Ft).
This Apple 8-pin Lightning connector to USB cable is Apple-certified, and as such you would not have any issues with iOS 7 compatibility for syncing and charging.
Apple licensed technology:
“Made for iPod, iPhone, iPad” mean that an electronic accessory has been designed to connect specifically to iPod, iPhone, or iPad, respectively, and has been certified by the developer to meet Apple performance standards”