I just bought this, and I am not very impressed! First of all the glass sleve does not stay put! It falls right off! So how safe is that? We had to put clear rubberbands on the vibrator, just to get the sleve to stay on! Also on the bottom, it states it is for external use only, but the way it is shaped will make you think otherwise. Also very loud! So if I were you, buy an expensive glass vibrator so you do not have to go through this trouble!