- Sprague Rappaport type, with chestpiece drum and 5 interchangeable fittings: adult and pediatric diaphragms, and 3 bell chestpieces
- Patented valve mechanism virtually eliminates acoustic leakage
- Gasket sealed system. Double tube configuration improves stereo separation
- Accessory pouch contains the 3 bell chestpieces, chestpiece key, spare adult and pediatric diaphragm and two extra pairs of eartips
- Five year warranty, Latex-Free
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