Audio-Technica ATH-SQ1TW True Wireless In-Ear Headphones (Popcorn White) - Manual (Page 23)

Using the product
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To end a call, touch and hold (about 2 seconds) the touch sensor on the L (left) or R (right) side
headphone.
Calls can be ended from either the L (left) or R (right) side headphone.
If the call was received while listening to music, playback is resumed.
Music playback may not be resumed on some Bluetooth devices. In this case, music playback must be started
manually.
Making/receiving calls is also possible with only one headphone by removing only one side from the charging
case and putting it in your ear. When you use only one headphone, some functions are not available
depending on which side is worn. Use the Bluetooth device for operation in such cases.
R (right) side headphone touch sensor operations
1 Touch sensor
Operation Function
Touch Receiving a call: Answers the call.
Touch and hold (about 2 seconds)
Receiving a call: Rejects the call.
During a call: Ends the call.
The controls explained above may not be available on some smartphones.
L (left) side headphone touch sensor operations
1 Touch sensor