* 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 high frequency performance * A rubber gasket recessed in chestpiece alters the diaphragm permitting the scope to achieve multi-frequency response * Chestpiece made from lightweight zinc alloy plated with an attractive satin finish* Non-chill diaphragm retaining rim for patient comfort * Large bore chrome-plated brass binaurals in satin finish * Double leaf internal spring fixed at 15