This amazing hollow dong is the best at what it does - and what it does is double your pleasure! Built for the curious. and built to thrill. it wins the arms race for joy. With seven vibrating speeds and a built-in. adjustable stretch elastic waistband for comfortable wear. you don't have to worry about a harness. It's powered by two AAA batteries (not included) and constructed of durable black PVC. ABS. and nylon. Great for users of every identity with a harness that fits most.