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The Gilbert Device was one of the three Gilbert inventions created and used by Johnathan Gilbert, back in 1864 along with the Gilbert rings and compass. Although it resembled an ordinary automated music box, it was in fact, an enchanted object spelled to produce a supernatural frequency lasting five minutes that incapacitates anyone with supernatural hearing within a five block radius. Secretly, unknown to Johnathan, it was enchanted by Emily Bennett to make it work, although most people believe that he was solely responsible for inventing it.
The device came with a winding key that was kept separately in a pocket watch-like container. Johnathan Gilbert also wrote information on the device in his journals.