Audio-Technica ATH-S220BT Wireless On-Ear Headphones (White) - Manual (Page 9)

9
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 4 hours maximum to charge the battery fully. (This time 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. Otherwise, the battery
may deteriorate, possibly resulting in shorter periods of continuous use or may fail to charge.
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
Connect the included USB charging cable (USB Type-A side) to the computer to start charging.
While charging, the indicator lamp lights as follows. (It may take several seconds for the indicator lamp to
light.)
Indicator lamp Status
Lit red Charging
Off Charging complete
Flashing red Charging error [1]
[1] The headphones may be hot. Allow the temperature of the product to cool sufficiently before charging in a well-ventilated place (10 to 35°C
(50 to 95°F)) away from direct sunlight.
3
When charging is complete, disconnect the USB charging cable (USB Type-A side) from the
computer.
4
Disconnect the USB charging cable (USB Type-C side) from the product’s battery jack.
If you start to charge while the product is on, it will automatically turn off.