Electroshock E-stim Vibrating Prostate Massager - BlackProstate massager letft. s you regulate the 10 speed vibration area as well as the 2 electro shock areas, for extra stimulation. E stim devices deliver a variety of impulses, from a gentle tickle to a heavy throbbing throughout the body. Waterproof during vibration, not e stim. The electroshock function will only be activated when the ribbed parts touch the skin simultaneously. Measures 4. 7 in. long, 3. 54 in. insertable, 1. 54 in. diameter.