10 functions of passion! The waterproof Emerald Studs Arouser is made of glittery soft jelly. The insertable length of the penis shaped vibe is 7in with a swirled diameter of 1.75in. The base of the shaft has a raised ring to stimulate the outer vagina. The base of the vibe has EZ touch controls for scrolling through the 10 levels of vibration and pulsation. Requires two AA size batteries, not included. This is truly a gem!