These waterproof vibrating kegel balls are perfect for training of the pelvic muscles, but also for erotic pleasure! The ar eprovided with a solid draw string to remove the balls from the vagina. The powerful motor delivers 10 modes of vibrations. Press the power button to turn the unit on or off, and press the function button to switch between programs. The kegel balls are rechargeable via USB. The battery is fully charged in 2 hours, offering 50 minutes of play time.