昨年、12月に購入し、一ヶ月ほど使用しました。 不具合はございません。 充電に必要なtype-cのケーブルのみ欠品しております。

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Sony WF-1000XM4 Truly Wireless Noise Cancelling Headphone - Optimized for Alexa and Google Assistant - with Built-in mic for Calls - Bluetooth ...

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Sony WF-1000XM4 review: a sonic triumph - The Verge

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Amazon.com: Sony WF-1000XM4 Truly Wireless Noise Cancelling Headphone - Optimised for Alexa and Google Assistant - with Built-in mic for Calls - Bluetooth Connection - Black/Copper : Electronics