Audio-Technica ATH-CKS50TW Noise-Canceling True Wireless In-Ear Headphones (Black) - Manual (Page 13)

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Charging the battery
Fully charge the battery when using for the first time.
When the rechargeable battery is running low, the voice guidance will play the message “Low battery”, and the
indicator lamp will flash in red. Charge the battery as soon as possible.
It takes about 3 hours to fully charge the headphones, and about 3 hours to fully charge the charging case. (Charging
times may vary depending on usage conditions.)
Charge the product in a well-ventilated place (10 to 35°C (50 to 95°F)) away from direct sunlight. Charging outside
the normal charging temperature range may result in failure to charge or longer charging time. Otherwise, the
battery may deteriorate, possibly resulting in shorter periods of continuous use or may fail to charge.
Charging the headphones and charging case
1
Connect the included USB charging cable (USB Type-C side) to the battery jack.
The included USB charging cable is designed for exclusive use with the product. Do not use any other USB
charging cable.
When inserting the USB charging cable into the USB port or battery jack, insert it directly (horizontally).
1 2
1 USB Type-A
2 USB Type-C
2
Place the headphones in the charging case.
When charging the headphones, make sure the indicator lamps on the headphones light up. If they do not
light up, remove the headphones and place them in the case again.