it says "lub dub"
Heart sounds heard through a stethoscope applied to the chest. The first sound, a lub, coincides with the beginning of ventricular systole and closure of the atrioventricular valves. The second sound, dub, coincides with the beginning of diastole, and the closure of valves in the aorta and pulmonary artery.
pretty much right under my boob.
i love it.