All returns must include the following:
   1.  Original packaging (manufacturer's box, styrofoam, plastic bags, etc.)
   2.  Original intact UPC barcode. Do not cut out the UPC code (for rebates) until you have examined and tested the product to your satisfaction.           Removal of the UPC code voids any possibility of return regardless of RMA or credit request status.
   3.  Valid Return Merchandise Authorization (RMA). See RMA Conditions, below.
   4.  Original packing slip. Do not mail or dispose of the packing slip (for rebates) until you have examined and tested the product to your satisfaction.
   5.  All accessories (transformers, antennas, remote controls, batteries, software disks, etc.)
 
pour plus d'info :
http://www.cowonamerica.com/suppor [...] ranty.html