Named like a horror sequel, and small enough to fit in your handbag:

According to this article:

“The Banshee II generates a sound so loud and at such disturbing frequencies that, according to its inventor, a person has no choice but to drop whatever’s in his hands and cover his ears.”

“That’s why it’s such a safe, nonlethal weapon,” said Lee Bzorgi, director of the National Security Technology Center at the Y-12 nuclear weapons plant.

“It also has a frequency-switching system that pumps your ear drums, so it sounds like there’s a drum beating there,” he said. “You physically feel it in your ear drum.”