Bluetooth bone conduction earphones with 2-WAY audio function. - Type: Bone conduction earphones - Connection: Bluetooth / USB Type-A - Accessories: USB cable, instruction manual, case - Function: 2-WAY audio - 400-MM-BTSH72BK Thank you for viewing. Purchased in April 2025 and used for about a month, there are no noticeable stains or scratches, and there are no operational problems. I am selling these because I bought the AirPods I always wanted and no longer use them. Please understand that these have been used and are stored by an individual.