The Humm Dinger is a portable vibrating cock ring that can fit any size penis because of its super-stretch material.The original vibrating pleasure ring that launched a wave of copy cats! Humm Dinger is the brand name known the world over for its powerful motor and super sensuous stretch silicone, which is sure to please and tease both partners during intimate play time! Don't be fooled by the rest. Stick with the Best! It offers 20 minutes of continuous vibration and an easy on/off switch. Batteries are included for immediate use. Cock rings when worn around the base of the penis and testicles, many users find that cock rings increase sexual pleasure. Prolong rings, erection enhancement, climax control rings, cock rings. Humm Dinger Penis Ring Clit Stimulator Magenta from Hott Products Unlimited.