*SilverlLink 4 has Serial and USB converter connectivity. Upgradable to DAK. Compatible with SK550 SK560 SK580 SK830 SK840 SK860 SK890 560LC LC580 LC830 AG50 Knitting MachinesSilverLink4 Box, USB Cable, PowerSupply for DAK DesignaKnit 7 or 8 Software on Silver Reed SK830 SK840 SK860 SK890 Electronic Knitting Machines*