Hi, Beleive it or not E-bay offer these devices, they are fairly cheap around £20 and effective. I Have also heard from a very reliable source that if you buy one of those birthday cards that play a tune when you open them, remove the "music box" and put two or three of these in the holes this also works !!!!!!!!! it does sound bizare but it does seem to have the same effect and is a considerably cheaper......think about it happy B,day 24 hrs a day!!!!enough to move your neighbours too .