Headphone for sale. Product Details: Bone conduction headphones E6 Almost new, but please note that the included USB cable is missing. I gave these to my nephew as a gift, but when he tried them, the sound leakage was severe. Since he usually listens to music at a high volume, he couldn't use them at all, so I'm selling them. The instructions inside mention sound leakage. They recommend using a lower volume, but I think others will definitely be able to hear the sound. If you can think of a way to use them, please consider purchasing. The original price was just under 3000 yen, but I will offer them at a lower price. Thank you very much.