It says on the website:
White 4400 USB 4x4" Emb Machine 4000 Designs 31Fonts Card Digitize Size Format Color 100Needles 144Bobbins 44Threads, SVP Singer Viking Pfaff EM10 H79
So I have no clue, any ideas? I love singer so far well sometimes I guess only when my machine is working properly. lol!