Excellent condition SONY WF-1000XM4 earphone, right side only. The version has been updated to the latest 2.1.0. Pairing is only possible with version 2.0.0 or later. Please check the version before purchasing. If you don't know the version or are unsure, you will not be able to pair, so please refrain from purchasing. Returns are not accepted. The battery has been replaced with a new one. Since the product is over 2 years old, even if the device looks clean at first glance, many have batteries that don't last even an hour when fully charged, so this is recommended for those who want to use the earphones for a long time. SONY WF-1000XM4, right earphone only. There are some scratches, but it is clean. Charging, pairing, touch operation, noise canceling, and external sound input have been tested and confirmed to be working. Before use, be sure to initialize it in combination with your existing earphones. Free shipping. It will be packed in a waterproof film, wrapped in cushioning material, and shipped. Anonymous shipping for peace of mind. Immediate purchase is welcome. To ensure your peace of mind, hand washing, disinfection, and mask wearing are performed during the packing process. There are no smokers or pets. Type...Canal type Connection type...Wireless Features...Bluetooth, noise canceling