if there is a failure on the unit. your friend should be able to email you the amazon info that he baught it. he should also if it within the return time to have amazon make a pre paid shipping lable from his account. then all he has to do is send the lable to you as a pdf. all you do is take the unit to a shipper store and mail it back. when the return is done all your firend does is order a replacment unit to you.