Zinc alloy single-sided chestpiece with dual frequency diaphragm. specially designed membrane lock, wihtin the chestpiece, alters the diaphragm to achieve dual frequency. hold the chestpiece to achieve low frequency response and apply firm pressure to achieve high frequency diaphragm response. comfortable,. non chilling ring, lightweight, steel binaurals with internal spring. 22 inch latex y-tubing with deluxe eartips.
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