I feel very cheated about this product. I ordered from a photo showing the DMM903S but they invoiced and sent the DMM903. I realized after they shipped and told them of the error. Their eventual response to me was that DMM903 and DMM903S were the same product. They are not the same. DMM 903 does not hold Godox macro lights in a constant position the arms bend down when the lights are fitted. Do not buy this product