Yamaha YH-E700B Wireless Noise-Cancelling Over-Ear Bluetooth Headphones (Black) - Manual (Page 39)

No sound can be heard
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The product is not connected to a Bluetooth device.
Pair this product.
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“Pairing for the First Time” (p.15)
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“Pairing with a Different Device” (p.19)
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The volume is too low.
Raise the volume.
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“Operations during audio playback” (p.25)
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The audio stopped playing back.
Start playback.
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“Operations during audio playback” (p.25)
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The headphones are not worn in the correct position while In-Ear Detection is on.
Wear this product in the correct position.
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“Putting the headphones on” (p.24)
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“Operations during audio playback” (p.25)
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Troubleshooting > No sound can be heard