D-Link Air DWL-120 Manual page 40

After an RMA number is issued, the defective product must be packaged
securely in the original or other suitable shipping package to ensure that
it will not be damaged in transit, and the RMA number must be
prominently marked on the outside of the package. The package must
be mailed or otherwise shipped to D-Link with all costs of
mailing/shipping/insurance prepaid; D-Link will ordinarily reimburse
Purchaser for mailing/shipping/insurance expenses incurred for return of
defective product in accordance with this warranty. D-Link shall never
be responsible for any software, firmware, information, or memory data
of Purchaser contained in, stored on, or integrated with any product
returned to D-Link pursuant to this warranty.
Any package returned to D-Link without an RMA number will be rejected
and shipped back to Purchaser at Purchaser's expense, and D-Link
reserves the right in such a case to levy a reasonable handling
charge in addition mailing or shipping costs.