The Neutronic Ear, or Personal Sound Amplification Product, was invented by American entrepreneur Michael Nehr. In 2001, Nehr was arrested in the state of Pennsylvania and charged with multiple felony counts related to his sales of the Neutronic Ear.
Nehr began selling Personal Sound Amplification Products through the mail in the late 1990s. On Sept 11, 2001, he was arrested for the sale of a non-FDA approved medical device. The subsequent court case lasted for 10 years, but in 2011 Nehr was found not guilty on all counts. As of 2015, Nehr works as the CEO and founder of Crystal Care International, the company that markets the Neutronic Ear.