On or off, no in-between
I, too, bought this at Walgreen's (but paid more than I would have here at amazon, so I'm suitably chastened), and to my dismay have discovered that the stars are VERY bright and the sounds, even with the volume turned all the way down, are VERY loud.  We keep this little orb in my 3 y.o. son's room, but will soon replace it with something that shuts off after 15 minutes or so, because I don't want the kid to get dependent on a nightlight, even if it is a lovely blue celestial glow bathing his room in faux moonlight.  Why is this thing so LOUD?!  I'm going to tape a cotton pad over the speaker in order to be able to use the sound feature, but the sounds themselves are unobjectionable, despite being deafening.
Rating: 3 stars