You can fit a couple minutes of humming into pretty much any routine: Add it to the end of a workout, on your way to work, at bedtime or in the bathroom.

Measuring just over 1 square inch, the device could help those with dysfunctional vocal cords regain their voice function.

The size and shape of the vocal folds determine how a voice sounds. Swelling or irritation of the vocal cords can limit the usual vibrational movement, leading to a person’s voice becoming hoarse.

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