A violet ray or violet wand is a device used for the application of low current,high voltage (min 10kV to max 50kV typically), high frequency electricity to the body using a Tesla coil, originally sold as a quack medical device claimed to be useful in electrotherapy, though, since the 1990's, it has been used largely as a sexual stimulation device and by hairdressers to stimulate the scalp. It is especially popular among the BDSM community though antique models are also popular among collectors of quack medical devices. The violet wand was recommended by Edgar Cayce.