Yamaha TW-E3C True Wireless Earbuds (Red) - Manual (Page 53)

List of support centers
If the trouble still cannot be solved, please contact us for product support as shown below.
For customers within Japan
(
Please contact the store where you purchased this product, or the Product Support Center as listed in the
“Safety Brochure” included with this product.
For customers outside of Japan
(
Please contact your nearest authorized Yamaha dealer or service center.
https://manual.yamaha.com/av/support/
53
Troubleshooting > List of support centers