Hello LongArc, I don't know which particular SA-250 you have, but even if it doesn't have a provision for "plugging" in a remote, you can likely install one. It may require a bit of creativity on your part and if you are willing to share a bit more information about your specific machine I would believe that there are a few folks on the forum here who could help you out with accomplishing it. I believe, KSellon, Fixalinc, Remeger(hope I got that right), or possibly a few others could help you out. Post up the machine specifics regarding ser. no. and such and I would bet they can be of help to you. Best regards, Allan