Percussa micro super signal processor

Gizmodo scoops CDM today for latest riot-control technology with the Sonic Devastator (though, um, some spelling issues with the product?) This ain't just for your German punk band, kids: it's a real DIY weapon.

Create an ultrasonic blast capable of "inducing intense pain and
discomfort in humans and animals." Oh, and it even has adjustable
filter sweeps. Buy it assembled for US$300 or, better yet, get digital
plans for US$20.