You can use the accompanying cable to charge and sync your iPhone 4. But if you need a portable way or more functions, maybe Twig the ultra portable sync & charging cable can meet your requirements.
The Twig is an ultra portable, multi functional charging & sync cable that measures only 4 inches long, and designed for iPhone and other iOS devices. As we can see from the images, the sync & charging cable features compact design, and comes with three bendable legs, in addition to charging or syncing your iPhone, iPod touch or iPad, the charging cable can be bent as an portable iPhone stand for video chat, or as a tripod for your shoots. Apart from that, the USB cable is perfect to organize your headphone cords just like a headphone cord organizer.
At present, the designer of Twig is raising find at Kickstarter. Pledge $18 will let you own the multi functional sync & charging cable. If you’re interested, jump to Kickstarter official site for more details.
Additionally, if you need other options, you might like to check Une Bobine sync & charging cable and more via “charging cable” tag.