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There's a small round button. Just depress it.
Sorry, there was a problem. Please try again later.Thank you for contacting Sony, Margi. To toggle through Noise Canceling, Ambient Sound, or turning them off, just press the NC/AMB button on the left earcup. You’ll hear a voice guidance prompt letting you know which mode you’re in. We appreciate your interest in Sony products. Should you require any further assistance, please don't hesitate to reach out for support here: https://us.esupport.sony.com/support/s/support-contact?language=en_US&category=headphones Best regards, Gus, Sony North America Customer Support
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