Has anyone actually used something like this?

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Apparently pinterest thinks I'm interested in this. These things just look really funny and got me curious if anyone on here has used them or known someone that has?

I guess they stick to you and send pulses that trigger your nerves to make muscle contractions.
Has anyone actually used something like this?
I've used it
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I know someone that's used it
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No idea who has used that
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Has anyone actually used something like this?
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