Ostensibly, it is a ring around 3/4 metre across that is segmented into 4 internal circles each containing a rotor blade driven by a motor. A full charge lasts around 12 minutes and it can be controlled from an iPad, iPhone of Android App. Although this description sounds a bit rough, as the video and photos show, it is in fact very elegant in its design. And boy does it perform in the hands of a skilled operator. Spectacularly!