D2D160-BE02-11 64650424 M2D074 230/400V 700W Frequency Converter Centrifugal Fan Contact Us: For a presumably defective product received, please tell us where the problem occurs, and our Customer Service and Technical Department will work it through with you. Pictures and videos can come in handy here.For any confusing or false description in the listing that causes a mis-purchase, please kindly remind us so we can improve our listings and continuously offer a better purchasing experience to you and to all our customers as well. If the wrong transaction is caused by our mistake, we would be responsible for the return cost.We wish you understand us, and our effort will always come to your aid.