Yamaha TW-E7B Noise-Canceling True Wireless In-Ear Headphones (White) - Manual (Page 36)

Cannot connect
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Earbuds (L) and (R) are not connecting properly.
Put the earbuds back into the charging case and then take them out again.
The earbuds will turn on and both earbuds automatically connect. The indicators display as shown
below.
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Power on: Blue Lights up for 1 sec
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Earbuds (L) and (R) are now connected: Purple Lights up for 5 sec
The indicators may flash blue for a while after you remove the earbuds from the charging case.
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The product is not pairing correctly.
If the information for this product still remains in the list of connected devices on your Bluetooth device,
delete that information and try pairing again.
(
“Pairing with a Different Device” (p.20)
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The information for a Bluetooth device that was registered on this product was deleted.
If you pair a device beyond the maximum number of pairable Bluetooth devices, the information for
device you first paired (the oldest pairing) is deleted. Pair this product once more.
(
“Pairing with a Different Device” (p.20)
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This product may already be connected to another Bluetooth device.
On your Bluetooth device, remove the connection with this product and then connect this product
again.
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This product and your Bluetooth device may be too far apart.
Move this product closer to the Bluetooth device.
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A device that emits electromagnetic waves (such as a microwave oven, access point and so on)
might be nearby.
Do not use this product near other devices that emit electromagnetic waves.
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Troubleshooting > Cannot connect