I purchased this after my son outgrew his mobile. He loved to watch his mobile and I didn't know if I could find something to take it's place. When I first put this in his crib, I turned it on with the bubbles and everything. I think that kinda freaked him out at first. Then I adjusted the settings to where it is just the lights and music. Now he lays there and stares at the lights and fish and goes off into sleepy-land. Another perk is the songs aren't that annoying (like many other baby toys). They are are calming and relaxing. I highly recommend this item for anyone looking for something to lull their child to sleep. It works!