Silver Knitting Machine Easy w Auto Changer MODEL AC-5 This is an optional accessory for the Silver Knitting Machine, the "Auto Changer (MODEL AC-5)". It is a device that automatically changes between 4 colors of yarn. My family used it temporarily and then it was stored for a long time. I do not know how to use it, so I have not been able to confirm its operation. Regarding the exterior condition, apart from some discoloration on the stickers, there does not appear to be any significant damage. The box is damaged. Everything shown in the photos is included. The instruction manual is not included, so we ask that those who are knowledgeable about this product consider purchasing it.