I couldn't hear well out of this. I heard better with my crappy Prestige stethoscope. I sent it back, bought the Cardiology III (which is too expensive, in my opinion, but I was having problems with the ear pieces hurting in the Prestige, and the cheaper Littman Lightweight wasn't doing the trick with sounds), and really like it. The oblong-shaped diaphragm piece on this product may be good for blood pressure measurement, but it's not as great for heart sounds or for listening in small areas (or on small chests). If you don't have the thing pressed down just right, part of it sticks up, and you can't hear. I heard a lot of "artifact" buzzing and rustling, but not much in the way of lung sounds and heart sounds. I don't think it's worth the money...I'd say either go cheap, or go expensive, but this product didn't cut it for me.