I love this thing. It’s a retractable USB cable with one end having a connector that you can snap on tips for lots of different cell phones, so that you can charge your phone over USB. It’s great when I’m travelling; I often have a USB port more easily available than a power plug, and I don’t need to carry a larger cell phone battery charger. I’ve used it with several different cell phones so far and am very, very pleased with it.