I wish this was invented when I had my first child! I received this as a gift from a friend who was in 'the know', and it was one of my most used items in the first couple of months. It saved me from passing out from over sssshhhing, and I could just concentrate on my rocking instead ;) My baby loved it, he really calmed when this repetitive noise came on. I loved it how it also disguised background noises and worked well as a white noise machine, not just as a calming tool. Easy to use, and you can make it as loud, or as soft as you like. Different timing settings too. Now is my go to gift for friends who are pregnant.