Yamaha TW-E7B Noise-Canceling True Wireless In-Ear Headphones (White) - Manual (Page 15)

Turning off the power
When you put the earbuds back into the charging case, the earbuds turn off.
1
Place the earbuds in the charging case.
The earbud power will turn off, and the product will enter charging mode.
NOTE
When you want to turn off the earbuds without putting them back in the charging case, hold down the function key on earbud (L) and
the + (plus) key on earbud (R) until the indicators light up red. You will hear the “Power Off” audio message in the earbuds.
7 sec
Red
Lights up for 1 sec
Earbud (L) Earbud (R)
15
Charging and Powering > Turning off the power