opn sound mezzo wireless bluetooth bone conduction black neckband headphones with microphoneMezzo bone conduction headphones from OPN Sound are designed to provide an optimal audio experience without sacrificing comfort. Lightweight, ergonomically designed, and featuring an open ear design, Mezzo allows you to enjoy rich sound and hear your surroundings with ease while delivering a comfortable and secure fit for all day wear. These open ear headphones are IPX5 water resistant so theyll take you through extreme weather and heavy sweat.