The elastic and sturdy erection band on the Big O vibrating cock ring helps keep him harder for longer. It also has a two-function motor. If you want a constant, forceful vibration, push the button once. If you want a powerful, multi-functional pulsation, press the button a second time. For the type of sexual encounter for which The Screaming O® is famous, The Big O provides couples with the utmost stimulation through powerful, targeted vibration.