This thing died on me in the first 15 minutes. I think the button batteries had been in there a long time and discharged. I bought new batteries and the thing didn't work at all! I don't like any toy with button batteries because they can't possibly give enough vibration (unless you are a woman). It hit the Prostate perfectly and was a weird sensation for me. Fluid will flow.:-) I just hope it works for you. It is non-returnable so I lost on this one. Take a chance though because the concept is great! I wish it worked with the new batteries!