Is that a ring on your finger? Nod is a gesture control ring that lets you turn your movements into commands.
Nod uses micro-gestures ( swipe, rotate, multi finger and 3D gestures ) which are much more sensitive than traditional gestures that have been used previously.
Nod is now available for pre-order. It will begin shipping Fall 2014. The wearables market is only getting better. Products such as these excite me.