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Thank you for contacting Sony. When you plug in your WH-CH720N, a solid orange indicator light will turn on right near the USB-C charging port to let you know they are juicing up. Once the headphones are completely fully charged, that orange light will automatically turn off. 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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