Yamaha TW-E7B Noise-Canceling True Wireless In-Ear Headphones (White) - Manual (Page 29)

Talking on the phone
You can use this product to talk on the phone when connecting to a Bluetooth device such as a smartphone.
Operate this product as follows.
R L
Function key − (minus) key + (plus) key
(
Receive a phone call
When a phone call comes in, press the function key.
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End a phone call
During the phone call, hold down the function key for at least one second.
Take your finger off the key once you hear the beeping sound.
(
Ignore a call
When a phone call comes in, hold down the function key for at least one second.
Take your finger off the key once you hear the beeping sound.
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Turn the volume up
During the phone call, press the + (plus) key.
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Turn the volume down
During the phone call, press the − (minus) key.
NOTE
When a call is coming in, any audio being played will be paused. Audio playback will automatically resume when the call ends or you
ignore the call.
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Operation (Audio Playback and Phone Calls) > Talking on the phone