The Macho Crystal Pulsating Erection Keeper Ring Clear super stretchy vibrating sensation for both. The look of glass. The feel of jelly. Vibrating clitoral stimulating nubs. 7 functions. Easy to operate. Push button power control. Waterproof vibrations for play outside the bedroom. Waterproof sex toys with this designation are safe for use in the bath or shower. Do not submerge for long periods of time and take care to thoroughly dry after each use. Vibrating cock ring requires 2 AG10 batteries, included. Made using phthalate free, non-toxic material: SEBS. Cock ring measures 2 inches long. Always clean before and after use. The Macho Crystal Pulsating Erection Keeper Ring Clear from Nasstoys of New York.