Sony Support

Article ID : 00345132 / Last Modified : 02/25/2026Print

Where is the serial number on the Truly Wireless headphones

    The serial number on Truly Wireless headphones is a seven-digit number printed on the bottom of the charging case. It is located next to, above, or below the model name (WF-xxxxx) or model number (YYxxxx).

    The image of the WF-1000XM4 charging case. The 7-digit number is printed to the right of the model name (WF-1000XM4)