...and has potentially long-term side effects.

Use of the device has come under fire because of the potential for permanent hearing loss. Human discomfort starts when a sound hits 120dB, well below the LRAD's threshold. Permanent hearing loss begins at 130dB, and if the device is turned up to 140dB, anyone within its path would not only suffer hearing loss, they could potentially lose their balance and be unable to move out of the path of the audio. The device is also entirely operator dependent, which could lead to serious ramifications if the officer in charge doesn't have sufficient training.


If you've encountered the LRAD Sound Cannon, please drop your experience in the comments below.

Image via jbouie

This post originally appeared on Gizmodo in 2011 and has been updated to reflect the LRAD's use in Ferguson Missouri.