Bridge the gap between science and nature with F1s, the next generation pleasure product for men that makes you the master of your destiny. And with a window in the casing, you can add a never-seen-before element and see your pleasure in action.Using powerfully intense dual motors, Cruise Control? and LELO?s revolutionary SenSonic? technology, F1s massages you with deeply satisfying sonic waves for an entirely new, completely mind-blowing sexual experience. Or better yet, utilize the free SDK to create your very own sensations and track your progress – and prowess – through the customizable internal sensors!