Remote Vibration Kegel Balls from ML Creation. Super powerful and USB rechargeable. Overview medical Silicone, environmentally friendly plastic. 8 vibration modes. Auto cycle modes can be chosen. Remote control distance approximately 32.8 feet. 40 minutes of charging = 1 hour of use. Water resistant. Balls approximately 3.74 inches in length, 145 inches in diameter. Bullet vibrator can be taken out and used alone.