50 Cent released his own headphone brand, SMS Audio.
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16 Things You Didn't Know 50 Cent Had Done Since His Last Album Release

4. 50 Cent released his own headphone brand, SMS Audio.
In 2011 50 Cent founded SMS Audio, a consumer electronics company focusing mainly on headphones. That same year 50 acquired Kono Audio, and while the headphones are still selling, this year 50 Cent had to pay out a remarkably large sum when he lost a lawsuit filed against the company.