New, Unused Sony WH-CH520 W Wireless Stereo Headset White WHCH520 W The following is an excerpt from the product introduction: ● Rich, high-quality sound with app support, compact and comfortable fit ● Clear sound quality with a good balance from high to low frequencies Equipped with "DSEE" (*) which reproduces the high frequencies of compressed audio sources clearly. You can enjoy vocals and instruments with a natural and clear sound, with a good balance from high to low frequencies. * DSEE can be enjoyed by enabling the function from the "Headphones Connect" app. ● Lightweight and comfortable to wear every day Uses ear pads made of smooth, low-rebound urethane foam with few wrinkles. The soft and comfortable ear pads provide a comfortable fit. On-ear headphones instead of over-ear headphones, so they are less likely to get stuffy in the summer and are easy to use! ● Long battery life & quick charging that allows approximately 1.5 hours of playback with a 3-minute charge Up to 50 hours (*) of music playback is possible. Furthermore, it supports quick charging, which allows approximately 1.5 hours (approximately 5.5 hours with a 10-minute charge) of playback (*) with a 3-minute charge. * Continuous music playback time during wireless connection. The codec is AAC. When DSEE/equalizer is equipped, it is OFF, and all other functions are at initial settings. ● With DSEE, the high frequencies that tend to be lost in compressed audio sources are compensated within the headphones to the equivalent of CD quality. ● Comfortable wearing is achieved by changing the ear pads and adding a head cushion. ● Hands-free calling supported Hands-free calling (*) is possible with smartphones, iPhones, and PCs. * Smartphones, iPhones, and PCs must have Bluetooth functionality and support HFP or HSP. It may not be supported depending on the software and environment you are using. 【Specifications】 Type: Sealed, Dynamic Driver unit: 30mm Continuous music playback time: Up to 50 hours Charging time: Approximately 3 hours Communication method: Bluetooth standard Ver. 5.2 Power Class 1 Weight (g): Approximately 147 g Multipoint connection: ○ Main accessories: USB Type-C cable (approx. 20cm) Shipping may be disassembled due to shipping costs. Thank you for your understanding.