Black wireless earphones utilizing bone conduction technology. - Type: Bone conduction earphones - Color: Black - Accessories: Instruction manual, charging cable I've used them twice, but they don't fit my head, so I'm selling them. The quality isn't particularly cheap, so I think it's pretty good (they cost around 8000 yen on Rakuten). They have a microphone, so I think they're good for calls during work.