That was the sound of an electronic exoskeleton, developed by a small Israeli high-tech company, propelling the 41 year old paraplegic down the street with a proud expression on his face.
The device, called ReWalk, is the brain child of engineer Amit Goffer, founder of Argo Medical Technologies.
While ReWalk helps paraplegics, people paralyzed below the waist, to walk, stand and climb stairs, for Goffer, the device has a much more important impact on the user.
Goffer himself was paralyzed in an accident in 1997.