Humm Dinger Cock Ring Clit Stimulator Crimson. The Humm Dinger is really a portable vibrating cock ring that may fit any size penis due to its super-stretch material. It provides twenty minutes of continuous vibration and a simple on/off switch. Batteries are incorporated for fast use. Cock rings when worn around the bottom of your penis and testicles, many users discover that cock rings increase sexual satisfaction. Prolong rings, erection enhancement, climax control rings, cock rings. Phthalate free, non-toxic materials: Thermoplastic Rubber TPR. Proven in pink, ships in crimson. Hott Products Limitless