Durex Devil Ring The Durex Devil Ring is a penis ring with a vibrating clitoral stimulation attachment , designed to give women a more intense sensation during sex. When worn around the base of the penis, this cock ring can help a man maintain a hard erection for longer, while the vibrating head with horns is designed to deliver up to 30 minutes of intense vibrations . It is made of an elastic, easy-to-apply material, meaning it fits most men. Small, discreet and quiet, this ring can be easily packed for travel, kept in your bag or on your bedside table. This ring can be used with or without a condom and fits discreetly at the base of the penis. Do not use for more than 30 minutes and wait at least 60 minutes before next use. Do not fall asleep while wearing the ring. It can be used with condoms for safer sex and with lubricants or gels to explore different sensations. Batteries are included but are not replaceable.