Yamaha YH-E700B Wireless Noise-Cancelling Over-Ear Bluetooth Headphones (Black) - Manual (Page 14)

Remaining Battery Power
After this product is turned on, an audio message tells you how much battery power is left in the
headphones.
(
Audio messages:
(
Battery High: plenty of charge remaining
(
Battery Medium: moderate charge remaining
(
Battery Low: small amount of charge remaining
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Charging and Powering > Remaining Battery Power