We're sending a lot of our unused cords, etc., to a recycling event in our town. I found this cord (actually, 2 of them) and they look new, but we have no idea what they are for. I don't want to get rid of something we could use. Here's a pic of the end of the cord. It has a shut-off close to the end with the 2 holes. The plug in for the wall is just 2 prongs. any ideas? Thanks!