Sony Wireless Headphones WH-CH520: Bluetooth Compatible Sony Store Price: 7,700 yen (tax included) Lightweight design, approximately 147g Compatible with a dedicated app, allowing customization of sound quality with "Equalizer" settings. Black Up to 50 hours of music playback. Hands-free calling possible with smartphones, iPhones, and PCs. Supports quick charging, with approximately 1.5 hours of playback from a 3-minute charge (approximately 5.5 hours from a 10-minute charge). Operation confirmed. Used for about a year, but there are no noticeable scratches or stains. No accessories included.