Two Japanese researchers have invented a speech jamming gun that makes people stop conversing within seconds forcing them to be silent.

Kazutaka Kurihara, a media interaction research scientist at the National Institute of Advanced Industrial Science and Technology, and Koji Tsukada, an assistant professor at Ochanomizu University, developed the SpeechJammer, which can keep people quiet instantly by freezing their brain, reported the Daily Mail.

The device, which has a handle and a microphone on it, records the speaker's speech and then sends the words back to them within few seconds, that confuses the speaker and makes them to stutter before making them silent. But the technique doesn't cause any pain. This technique is called "Delayed Auditory Feedback."

The researchers tested the speech jamming gun on different scenarios and found that the SpeechJammer appeared to work much better when the speaker spoke loud, but never worked when some meaningless sound is uttered, a Medical News Today report said.

The study has been published in, an e-print service funded by Cornell University.

Check out the video to see how speech jammers work: