F1S Developer's Kit Red Smart Performance Console from Lelo. Thanks to its unique dual motor design, the F1S Red combines conventional vibrations with a totally new sensation never before experienced in a male pleasure product: SenSonic technology. It is the same high tech concept that made Lelo Sona the best selling sex toy in the world of all time. Instead of standard vibrations, one of the engines emits powerful sonic waves that penetrate deep into the penis, making it feel as if it is resonant pleasingly from all directions at once, instead of simply a tingling in the nerve endings of the skin surface It will help you achieve the most overwhelming orgasms of your life. Combined with the patented Cruise Control setting, which ensures that F1S never experience a frustrating power drop during vigorous use. Instead, monitor and intelligently control the intensity to ensure you get a completely perfect and uninterrupted experience. An exclusive Lelo application will be available to you when your product is shipped, compatible with iOS and Android. Connected by Bluetooth, the application allows you more and more detailed control over your personal pleasure. With the application, pleasure is at your fingertips. The amazing sensation of sonic waves and the patented Cruise Control technology make F1S Red the best act of self love. The exclusive and free SDK allows you to experiment with the sophisticated sensors and industry leading technology, and shape the future of your pleasure. Materials ultra smooth and soft to the touch Silicone canal, Aluminum case. Masturbator has a window panel for visual stimulation. 10 cutting edge performance sensors. 2 hours of use in one charge.