YOUR NEW DUAL HEAD STETHOSCOPE CONSISTS OF CHEST PIECE, TUBING, EARTUBE AND EARTIO WHICH IS USED FOR AUSCULTATION, OR LISTING TO VARIOUS SOUNDS PRODUCED BY THE BODY. THIS STET-SCOPE HAS A DOUBLE-SIDED SOUND DETECTING HEADS THAT LISTENER CAN RESERVE, DEPENDING ON WEATHER THE LISTENER NEEDS TO HEAR HIGH OR LOW FREQUENCIES, SIMPLE REALIZED BY ROTATING THE CHESTPIECE 180 DEGREE.