Brand new, unused item!! [Reference Price: ¥5,588] Employs "bone conduction" technology, which transmits sound directly to the auditory nerve via bone vibration. Allows you to perceive surrounding sounds without obstruction, making it ideal for sports and outdoor activities. Features IPX4-rated waterproof performance, suitable for use in harsh environments. In addition to enjoying music, it also has a hands-free function for making calls.