Review on Zerone K21 Business Bluetooth Headset: Sweatproof Wireless Earpiece with Noise Reduction Mic - Perfect for Office, Business, and Workout by Jason Dahlkemper

You can tell right away that it's kind of big and heavy. For you nerds, it weighs 14 grams, which is roughly the weight of a AAA battery. Thick and bulky behind the ear. The tube from the tip of the ear to the ear hole is too long for me. Length, weight and volume are the reason I am returning it. The sound and voice are fine, which is why I gave it three stars instead of one. My height is 5 feet 9 inches; Maybe if you are 6ft 5 inches tall or just have an unusually large head this would be perfect for you.