Description: it has special circular design, mainly for cardiac auscultation treble, bass, the sound of cardiovascular changes .Auscultation with the first of three large, medium and small bowl set the sound, when used according to different regions, different frequency range that corresponds to the use of audio-bowl to achieve the best frequency response characteristics of sensitivity, which applies to infants, children Adult, child sound, the sound lung, heart and treble, bass sound of a variety of auscultation