Has a USB Mini-B female socket on one end, and a USB Micro-B male plug on the other. Plus a little tether so you can connect it to a cable. With my mix of devices that have mini (battery charger, camera) and micro sockets (phone, nook), I’d have to carry around twice the number of cables. Now I carry two cables, each with one of these adapters on it. I also keep one on the car charger.