Technology
Portable sound units

Circuit-1
Here’s another one from Steve, portable sound units (and links on how to build your own) – “The AAA Portable Sound Units are small sound-systems triggered by a motion detector. They playback on-the-street interviews with the public about their opinions on outdoor advertising. Installed in the field, the units are designed to run on battery packs and conserve power by turning on only when pedestrians pass by them.”Link.

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