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Hi Sharon, thanks for your question! We're happy to assist. The Sony WH-CH520 headphones do not have a built-in mute button. To mute the microphone during calls, you'll need to use the mute function on the device you're connected to, such as your smartphone or computer. If you'd like to learn more about this product, please visit this link: https://helpguide.sony.net/mdr/2958/v1/en/index.html Thanks for considering Sony products! Best regards, Estefany
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