> Allowing the user to control the noise cancelling profile on a pair of wireless headphones with a phone app instead of further cluttering the headphones thems

> Allowing the user to control the noise cancelling profile on a pair of wireless headphones with a phone app instead of further cluttering the headphones themselves is a good idea. Bad idea. UI complexity should be proportional to the product use and customization complexity. If there are 3 basic levels for noise cancelling, then mechanical slider will suffice. If production quality is good it will last. I don't want to pull up my phone to perform such a mundane and simple task. Leave smart phone apps for more detailed and sophisticated configuration, which is probably not needed at all for such a device as noise cancelling headphones.