About this product:
To install the optional dual band wireless module:
The wireless module is optional for the HL-L9410CDN, HL-L9430CDN, MFC-L9610CDN, and MFC-L9630CDN. It’s included standard with HL-L9470CDN, HL-EX470W, MFC-L9670CDN, and MFC-EX670W.