Yamaha YH-L700A Noise-Canceling Wireless Over-Ear Headphones - Manual (Page 15)

Checking the remaining battery power
After this product are turned on, you can check how much battery power is left from the flashing indicator
and the audio message.
(
Audio messages:
(
Battery High: plenty of charge remaining
(
Battery Medium: moderate charge remaining
(
Battery Low: small amount of charge remaining
(
Indicator (on controller):
(
Flashes three times (red): plenty of charge remaining
(
Flashes two times (red): moderate charge remaining
(
Flashes one time (red): small amount of charge remaining
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Charging and Powering > Checking the remaining battery power