6, 7 and 12 Beat Loops Noted
The sounds on this unit will drive you up the wall if you are sensitive to repetitive sounds.  The White Noise looped every 12 beats and you could hear three distinct notes.  When placed on a wooden platform they were low frequency but when the unit was placed on something absorbent they were high frequency.  The brook had a rhythm of 6 beats if I remember now and the Fan noises a 7 beat loop.  How anyone could sleep to this is beyond me.  Obviously I'm sensitive to this and most folks aren't.  This is just a heads up in case you are.  Amazon cheerfully accepted a return.
Rating: 2 stars