Audio-Technica ATH-SQ1TW True Wireless In-Ear Headphones (Popcorn White) - Manual (Page 14)

Charging the battery
13
Indicator lamp Status
Flashing white Charging
Lights in white for 12 seconds, and
then turns off
Charging complete
Flashing white quickly Charging error
[1]
[1] Charge the product in a well-ventilated place (10 to 35°C (50 to 95°F)) away from direct sunlight.
4
When charging is complete, disconnect the USB charging cable (USB Type-A side) from the
computer.
5
Disconnect the USB charging cable (USB Type-C side) from the battery jack on the charging case.
When charging, make sure to use the included USB charging cable. The product may not charge with cables
other than the included USB charging cable.
Charging headphones without the USB charging cable
A rechargeable battery is built into the charging case. If you have charged the charging case, you can charge the
headphones without using the USB charging cable.
1
Place the headphones in the charging case and close the cover.
While charging, the indicator lamps light as follows. (It may take several seconds for the indicator lamps to
light.)
1 Indicator lamps
Indicator lamp Status
Lights in white Charging
Off Charging complete / Charging case battery has no power