Hearing aids are pretty sophisticated pieces of technology these days, capable of adjusting the sound they pick up to suit a range of different environments, from a noisy restaurant to a windy day outside. A button allows users to cycle between modes, but some go further, an app allowing the user to fine-tune things like the arc of sound captured, letting them hear what is being said by companions while blocking out extraneous sound.

In a video on CNN Money, a man whose hearing was badly affected by a brain tumor demonstrates how an app on his Apple Watch allows him to control his ReSound hearing-aid …  expand full story