The suffix is the 5th digit of the serial number on each unit. It starts from A to B, C,
D....
Example: XXXXXXXXXXX
5th digit: suffix (by alphabet)
KX-A405 DECT repeater (back)
KX-TGP500 base unit (back)
Serial number (S/N)
Serial number (S/N)
KX-TGP550 base unit (bottom)
KX-TPA50 handset
(in the battery compartment)
Serial number (S/N)
Serial number (S/N)
5