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They are very powerful vibrators, which is exactly what makes them good for massages. Main downside is that the muscles that most people would want to massage (back, shoulders, neck) are kind of hard to reach when you try to use it on yourself.

Oh, yah, it was developed by their medical equipment division. Also patented as a massager and was registered with the FDA as such. Then people realized what else it could do.

The really funny part is that hitachi’s main business is heavy industry stuff; power plants, cranes, electrical infrastructure, jet fighters, trains, semiconductors, all sorts of stuff. But everyone knows them for that one time they made a massager that everyone uses as a sex toy.

It was originally manufactured for relieving tension and relaxing sore muscles; however, it is most known for its use as a sex toy.