Features of your new product_ 2IPv6This machine supports IPv6.Features by ModelsThe machine is designed to support all of your document needs from printing and copying to more advanced networking solutions for your business.Some features and optional goods may not be available depending on models or countries.Features by models include:FEATURES CLX-6220 Series CLX-6250 SeriesUSB 2.0 ● ●USB Memory Interface ● ●Document Feeder ● ●Hard Disk ○Network Interface Ethernet 10/100 BaseTX wired LAN ● ●Network Interface 802.11 b/g wireless LANaa. Depending on your country, wireless LAN cards may not be available. Contact your local Samsung dealer or the retailerwhere you bought your printer.○Duplex (2-sided) printing ● ●FAX ● ●Optional Tray 2 ○ ○( ●: Included, ○: Optional, Blank: Not available)