Bone conduction wireless earphones; cases for bone conduction wireless earphones; bone conduction earphones; cases for bone conduction earphones; wireless earphones; cases for wireless earphones; earphones; cases for earphones; bone conduction wireless headphones; wireless headphones; headphones; loudspeakers; batteries; batteries for mobile phones; electric wires and cables; battery chargers; AC/DC power converters; digital audio and video players for playing music