The Must Vibra Ring Phosphorescent lights up in the dark! Designed for adventurous and diverse experiences. Developed to deliver maximum sensations during sexual intercourse, this high-quality silicone ring helps delay ejaculation, maintaining erection for a longer time and extending the duration of sexual contact. The phosphorescent MustVibraRing is definitely one of the best vibrating rings in the world. Designed by Clara Morgane, extensive research has been conducted to achieve the highest level of stimulation for both partners. Thanks to its exceptional flexibility, it adjusts to any penis size. This vibrating ring features a small switch to turn it on and off at any time. It can be used with or without a condom. Batteries are included with the ring.