This thing is a cheap piece of hot garbage. I make sure the area and suction cups are thoroughly cleaned before application. And the noise canceling on both were very similar. They also sound amazing. I can afford to keep buying the shoes for them to break only two months into me wearing them. I wore these for HOURS. They were really cute and seemed to be good quality. But, for the price ($15. They are a great investment! I already have 5 pairs of FitFlop Sandals and love them.