Educational Single Pole Switch, Physics Experiment Equipment, Single Pole Double Throw (SPDT) Switch, Black, Set of 3, 341210 I found this while decluttering, and I don't know what it's for, but after looking it up, this is what it said. (←I just pasted the description from Amazon) I haven't been able to confirm if it works. This item is new and unused, but it has been opened for photography. * Immediate purchase is welcome, and silent midnight purchases are OK ◎ * Free shipping! * Items may be shipped without the box or compressed. * Shipping is closed on Saturdays, Sundays, and holidays. * Please check the actual photos for the condition of the product. # Akko's products, no comments & immediate purchase OK