The app-connected F2S™ stamina trainer and stroker is here to revolutionize men's pleasure with its open-ended liquid silicone design for unrestricted enjoyment. When connected to the LELO™ app, F2S™ transforms into the ultimate endurance trainer with two specially developed exercise routines. The stamina trainer helps users build endurance and experience more powerful orgasms. Guided Kegel exercises for men will help them ensure a more satisfying sexual performance.