Another review, including measurements. https://www.innerfidelity.com/content/amazons-top-selling-cowin-e7-wireless-noise-canceling-headphones.
Summary: "I've tried, but I simply can't think of any good reason to recommend these headphones other than being able to wrap "noise canceling" and wireless" buzzwords around your blingy new black and chrome headphones. Sure, they're cheap; sure, they're not so horrible that your ears will bleed (I've heard way worse); but you get what you pay for. The Cowin E7 is just barely okay for the money."