Thank you for viewing. This is a listing for the earphones themselves only. Because they do not fully charge, the original battery has been replaced with a new genuine ZeniPower Z52H battery. All functions have been confirmed to work. You should be able to use them comfortably as issues such as failure to fully charge and rapid battery drain have been resolved, so please consider purchasing. I have included the test results of 2 hours of continuous playback with noise canceling ON and volume at 50% for your reference when purchasing. There are no noticeable scratches or stains, but there is a feeling of use. Please check the photos. The software version has been updated to the latest version 4.3.1. Please understand that this is a used item. I will clean and disinfect with alcohol before shipping. How to reset and initialize: https://knowledge.support.sony.jp/electronics/support/articles/00278109 How to pair: https://www.sony.jp/support/headphone/howto/linkbuds_s/bluetooth-connect.html?srsltid=AfmBOoo93rr7IauKRQstRxWJbcA5yVER0vSXikaVR6C0vTsIzTKxfgqx Please see the product description here: https://www.sony.jp/headphone/products/LinkBuds_S/?srsltid=AfmBOopwvYJkcO64rWRk6fXTEh7FC5vnrGGBKaagegr54M_TE1XyyoE4 Sony Model Name...LinkBuds S Other features...Noise canceling