Denwa Communications Premium DWP-M801D, Quick Installation Manual

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In case you want the refund by warranty, you have to include the
product identification (including the model and serial number), box
with the original product and a description about the failure that the
product has.
It also has to be included a clear evidence about the purchasing
date (bill) to show that the equipment is on warranty period.
Limited warranty: 1(one) year
GLOBAL WARRANTY
Limited equipment warranty