The Supersonic Stick on the Wrist for Blind People is basically a handheld sonar that attaches to the wrist and sends and receives supersonic signals, letting the user know if anything is in the way.

Wouldn’t it be interesting if it didn’t have just a set distance within which it signals obstacles, but a varying tone or hum, which would let a blind user scan his surroundings constantly and visualize it through interpretation of the sound’s volume.  More to come from this company.