These slippers are horrible. These must have need designed for someone with a massive head. )-The app works fine (I happen to have an android tablet so i can download new firmware updates and change the noise cancellation settings. This keeps them all together and I never forget! Sound seems to come through pretty well. Will be ordering more. These microphone covers worked great! The fit is great Nothing was thin enough to get into the speakers. These feel super comfortable and fit perfect.