Panasonic KX-TGF320UE Operating Instructions Manual page 60

For your future reference
We recommend keeping a record of the following information to assist with any repair under warranty.
Serial No.
(found on the bottom of the base unit)
Name and address of dealer
© Panasonic Entertainment & Communication Co., Ltd. 2017
Date of purchase
PNQP1778ZA
PP1022YM0