Thank you for viewing. I used it once to check the sound quality, and have stored it in a dark place since then. I am selling it because I didn't like the sound quality. 【High Sound Quality】 Provides high-quality sound, allowing you to enjoy music and calls clearly. 【Long-lasting Use】 The battery lasts for approximately 18 hours, supporting long-term use. 【Convenient Microphone Function】 The built-in microphone enables hands-free calls, providing comfortable operability.