Why I am just guessing the same reason I got mine... as it says in the Hammerhead Upstream ... working VIBRATOR To get the vibrator working on it. My girlfriend was pretty keen when she saw that... wanted that feature more than any other .. don't know why... personally... I'm more interested in getting Leste working on it... tell me when you get the vibrator working on yours for your girlfriend ... then it will make things easier for us to focus attention on Leste...