Yamaha YH-E700B Wireless Noise-Cancelling Over-Ear Bluetooth Headphones (Black) - Manual (Page 38)

The product does not operate or play back
(
This product may be charging.
You cannot use this product while it is charging. Use the headphones after charging is finished.
(
There is not enough battery power.
Charge this product.
(
“Charging the headphones” (p.11)
(
The product is temporarily not functioning in a stable way.
Turn the power off and then on again.
If this does not solve the problem, initialize (factory reset) the product.
(
“Initializing (performing a factory reset)” (p.43)
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Troubleshooting > The product does not operate or play back