Double Dinger vibrating penis ring. Humm Dinger "Double Dinger" is the "Original" Dual Vibrating Pleasure ring designed for couples. Dual motors stimulate the genital area to create MAXIMUM PLEASURE for both partners! Motors last approximately 40 minutes and come with batteries, which are replace-able! There are many other "Imitators' out there, so don't be fooled by the rest...be sure to stick with "The Best" the #1 (ORIGINAL) HUMM DINGER!