It's a reverse loudspeaker.The voice coil is attached to a weight while the relatively light magnet is mounted to a panel. The recoil from moving the weight shakes the panel to which it is bolted, and the panel radiates the sound - or vibration."jogger" is a fair description.
Never heard of such a thing! I imagine they sound crap!
uses Aura's patented electromagnetic actuator technology to convert bass sound waves into vibrations