Thank you all!! I did some googling, it is the on off thing for a quilters cruise control. I don't have a quilters cruise control. I just have the grace speed thing (the 80$one, not the 500$ one). I know the cruise control was not a part of my purchase. I did find the old emails from the seller with her phone number. I called her, I think she was shocked lol. She did mean to include it, and dose not need it, but it dose not go with anything I purchased. Thank you all again for pointing me in the right direction and identifying it!