The Lelo Luna Smart Bead helps you enjoy longer, stronger, and more regular climaxes. The touch-sensors measure your orgasm potential from the first squeeze. Allow the vibrations to guide you for an easy-to-follow routine. The Smart Bead automatically selects and updates the routine according to your performance, and remembers your personalized training routine each time you use it. The incredibly efficient Luna Smart Bead allows you to perform up to 200 routines from one single AAA. Materials: silicone, Size: , Power: AAA size batteries x 1