http://www.support.dlink.com/products/revision.asp?productid=EBR-2310
(Note: If you've never been to the United States support site before, you'll be prompted to select the country, then this link will take you directly to the product page.)
(Note: this product has variances in firmware and features between the revisions, you will be prompted to select your revision. This information is located on the underside of the router.)