"Hold on! One more thing, before dying! Do you know what happens when you hold two identical sonic devices against each other?" The Doctor and Donna confront Matron Cofelia and her men in this clip from 'Partners in Crime" | The Best of Doctor Who

10 Genius Devices That Will Silence Your Noisy Neighbors for Under $50

What’s an LRAD? Explaining the ‘sonic weapons’ police use for crowd control and communication