I'm selling a used charging case for the SONY WF-1000XM4 in silver, as I have an extra one. This listing is for the charging case only. It can be used with any WF-1000XM4 earbuds, regardless of color (white or black). Functionality has been confirmed: 1. Resetting by opening and closing the lid works. 2. Charging via a USB Type-C cable is possible (see photo 8). 3. Wireless charging is possible (see photo 9). 4. Charging earbuds from the internal battery works (tested with white earbuds, see photos 10-11). 5. LED indicator lights (colors during charging and reset operations) have been checked. Please refer to the photos for battery performance data. Depending on the battery consumption of the earbuds, after playing the earbuds for 3 hours and charging them from 70-80% to 100% using this charging case, the charging case's battery level was at 74%. Typically, if you listen to music for 2-3 hours, you can probably charge the earbuds 3-4 times (this is an estimate, please understand) (see photos 10-11). The exterior is relatively clean, but it is not new, so please carefully review the photos and the description of the operating condition. Cables and wireless chargers are not included. This is for the WF-1000XM4 charging case only. It will be delivered via postal service. Series: WF Series Sony Model Name: WF-1000XM4 5No30chi