Boing Boing and MAKE note a New York Times story about the Mosquito, a speaker unit produced by Compound Security which produces a high frequency sound (less audible to older people) in order to drive away teenagers hanging around in front of shops.
Boing Boing and MAKE note a New York Times story about the Mosquito, a speaker unit produced by Compound Security which produces a high frequency sound (less audible to older people) in order to drive away teenagers hanging around in front of shops.