This is an early 1900’s “Congress Medical Apparatus” Shock Therapy Quack Medical Device.
In the mid to late 1800’s to around the mid 1900’s, shock therapy was incredibly popular, as it was believed to be a cure-all. These little home kits date back to the 1800’s. Earlier models were powered with a crank and 2 spools, creating static, later models such as this one, were powered with a dry cell battery. These devices were used to treat everything from colds to miscarriage.