Audio-Technica QuietPoint ATH-ANC3 Guide De Dépannage page 18

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Audio-Technica Active Noise Cancelling Headphones may
be sent to any of the Authorized Audio-Technica Service
Centers listed below for warranty repair or replacement. For
details of warranty service, return approval, and shipping
information, contact the Authorized Audio-Technica Service
Center in your region.
All product submitted for warranty repair or replacement
must be pre-approved and must be sent prepaid and include
a sales slip, receipt or other proof of purchase date.
Defects due to normal wear, abuse, shipping damage, or
failure to use product in accordance with instructions are not
warranted. Unauthorized repair or modification, or removal or
defacing of the product labeling will void the warranty.