This is a "BiSAVE" showerhead with a hand-held water stop and mode switching function, allowing for efficient use with a water-saving rate of approximately 65%. I ran water through it once, but immediately dried it and cleaned it with alcohol. I am selling it because the head felt too large for my small children. I will ship it without the box to reduce shipping costs. Since it is used, I am selling it at a low price, so please understand.