The Electromax stethoscope offers electronically amplified sound of 50db at 100Hz. With the circuitry, amplifier and speaker built into the chestpiece, the unit can be easily controlled with one fingertip to adjust volume, change frequency to accommodate cardiac or respiratory sounds, and turn power on/off. Chrome-plated external spring binaural with white eartips and 22" 'Y' tubing. Bell diameter is 1 3/4". Comes complete with deluxe hard carrying case, instruction manual and two 1.5 silver oxide batteries. One Year Warranty.