Yamaha TW-E3C True Wireless Earbuds (Red) - Manual (Page 55)

Selecting the modes
(
Switch AMBIENT SOUND ON/OFF
Earbud (R) (single-tap)
(
Switch GAMING MODE ON/OFF
Earbud (R) (triple-tap)
Phone calls
(
Receive a phone call
Earbud (L) (single-tap when a call is coming in)
(
End a phone call
Earbud (L) (long-tap for about 1 second during a phone call)
(
Ignore a call
Earbud (R) (triple-tap when a call is coming in)
Other functions
(
Start pairing
With the power on: earbuds (L) and (R) (long-tap for at the same time about 3 seconds and then release)
(
Start voice assistant
Earbud (L) (triple-tap)
(
End voice assistant (Siri only)
Earbud (L) (triple-tap)
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Appendix > List of operations