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The FCC limits standard FM radio frequency transmitters to a very low power, so they are legal. Not supposed to interfere with commercial broadcasts though. "Mr. Microphone," a cheap heavily-TV-advertised toy from the 70s, was just a microphone with low-power transmitter. Great for pranks and passive aggression against shared-wall neighbors or people working outside with a radio blaring. Technically the content of the broadcast is still restricted as well, so saying "fuck" would be illegal even at low power, though the FCC doesn't have roving agents triangulating on every stray signal, and it would take a sustained/oft-repeated violation to attract their attention.
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