Audio-Technica ATH-ANC300TW QuietPoint Noise-Canceling True Wireless In-Ear Headphones - Manual (Page 16)

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Using the product
Quick hear-through function
1. Press the multifunction button on the L (left) side headphone.
• The headphones play a confirmation tone, and the quick hear-through
function turns on.
2. To turn off the quick hear-through function, press the multifunction button
on the L (left) side headphone again.
This function enhances external sound by focusing on people’s voices. The volume of music being played back
decreases automatically.
It is useful for when you want to listen to public transportation announcements or people’s voices. This mode allows you
to hear surrounding sound via the microphone while you are wearing the product.
Reset function
If the product does not work, or other malfunctions occur, place the headphones in
the charging case while referring to "Charging the battery" (p.7) for information
on inserting the USB charging cable to provide power, and then do a reset.
Disconnecting and then reconnecting the USB charging cable will reset the product
and should resolve any problem you are experiencing. If the problem persists,
contact your local Audio-Technica dealer.
Resetting does not change any of your settings (pairing information, volume
setting, etc.).
Auto power off function
The product automatically turns off after 5 minutes of not being connected to a device.