Audio-Technica ATH-CKS50TW Noise-Canceling True Wireless In-Ear Headphones (Black) - Manual (Page 30)

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Voice guidance
The product plays English voice guidance in the following situations.
Situation Voice guidance
Power is turned on
Voice guidance varies depending on the battery level:
Battery level high
Battery level medium
Battery level low
Bluetooth is connected Bluetooth connected
Bluetooth is disconnected Bluetooth disconnected
Noise-cancelling function on
(ambience control)
Noise-cancelling
Hear-through function on
(ambience control)
Hear-through
Off (ambience control) Off
Music is played Play
Music is paused Pause
Battery level is low Low battery
No power due to dead battery Please recharge