"Unique design that combines the acoustic response of a traditional bell and diaphragm into a convenient one-sided chestpiece. Bell-type low frequency response is achieved by simply holding the chestpiece in place with light pressure. Firm pressure will produce diaphragm-type frequency performance. A rubber gasket recessed into the chestpiece alters the diaphragm permitting the scope to achieve multi-frequency response. Custom molded extra thick bi-lumen 19\" PVC tubing stays soft and flexible. Extra thick tubing walls minimize extraneous noise. Includes one pair of plastic eartips and two pairs of ADSOFT™ PVC eartips (small and large). Overall length 27\". Weight 7.15 oz. Scope ID tag included. Lifetime quality performance guarantee. Latex free."