Very disappointed! I purchased one unite a few years ago ...
UPDATE (Aug 2, 2017): After unplugged and plugged back in, the sound got softer. I guess first plugging to the outlet made the noise or not. I am glad that now the new unit is quite as the old unit.<br /><br />I purchased one unite a few years ago and it has been working quietly, functionally well still. I received the second one 10 days ago and noticed the noise differences between the two units. I have been trying not to be bothered by the noisy unit in my baby's room. Still, the noise  is annoyingly loud. I am wondering what cause the noise differences between the two units! If the second one is malfunctioning, I would like to return the unite without a box. I have already thrown away the box came with the unit. Need your assistance to return the second unit! I would like to order the third one if units are quite as my first one. Thanks!
Rating: 5 stars