One is really, really, loud. We have boosted the volume level compared to our previous model, which was probably the loudest stethoscope on the market at that time. Amplification is more than 100X that of a conventional stethoscope, 40dB. However, such comparisons are not exact. It's not that easy to get a baseline measurement of the loudness of a mechanical stethoscope. So we're making a relative measurement, but the baseline we're using is somewhat tricky to measure precisely. So these numbers are approximate.