Got this to simulate a Mars light for my F unit, not even close to that kind of flash, more like a light house or radio tower beacon light flash. Since it was special order, I cannot return it to the shop I got it from. Just asking what I paid for it. $20 plus shipping, will fit in a flat rate padded envelope. Its resealed in its original package with all paper work. Will operate from battery power or track power. Thanks Mike P.S I would swap this for a nice Mars light circuit!!!