How the Acousto Magnetic Tag Actually Works
You've probably walked past an acousto magnetic tag hundreds of times while browsing your favorite clothing store or picking up some electronics. It's that little plastic box pinned to a sweater or the thin, slightly raised sticker hidden on the back of a perfume box. While we mostly notice them when they accidentally set off a store's alarm system, there's actually some pretty cool science happening inside those little guys that helps keep stores from losing their inventory. ...