VOLO Beauty’s co-founders Jonathan Friedman, left, and Ryan Goldman show their cordless blow dryer. The company debuted the product at CES.

VOLO Beauty’s co-founders Jonathan Friedman, left, and Ryan Goldman show their cordless blow dryer. The company debuted the product at CES. Photo by Jamie Scott Lytle.

— Ryan Goldman held his hand to the mouth of the roaring blow dryer, feeling its power and heat...

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