My slave has one these which we bought becuase the batteries were always running out on the normal ones - she loves to cum and cum and this little beauty certainly fits the bill. She is often very wet and ejaculates when I make her use this vibrator - particularly if she has a big dildo and a butt plug in place. She calls it her LBF (Little Brown Friend) and won't go anywhere with out it - only problem is that ours is 240v (UK) and when we go to Florida it's rubbish at 110v.....and she can't have half the orgasms she wants whilst we are there - never mind its a good punishment!! Great product!