An ergonomic design ensures comfort for the doctor and patient, even during extended use. The MD One is a premier diagnostic instrument with unmatched performance, durability, and aesthetics. Chestpiece The handcrafted stainless steel dual-head chestpiece is precisely machined and hand polished for the highest performance and durability. The full-rotation acoustic valve stem with green indicator dot allows the user to easily identify the active sound channel and seals in sound. The chestpiece is fitted with an ultrasensitive diaphragm sealed with a non-chill retaining ring to provide a secure acoustic transmission. The extra large bell, crowned with a non-chill bell ring, provides greater sound amplification, isolation of low frequencies, and patient comfort. Comfortseal eartips Soft silicone ComfortSeal eartips are phthalate-free and clear for hygienic purposes. To ensure proper fit and isolation of sound, MDF ComfortSeal eartips are available in three sizes: small, regular, and large. Ergonomax headset and Safetylock Hand polished, pre-angled stainless steel headset features a patented internal dual-leaf spring construction for durability. Patented SafetyLock eartip adaptors lead the industry in user safety. Acoustic Tubing Constructed of thicker, denser, latex-free PVC, the Y-configuration non-stick acoustic tubing provides insulation for superior sound transmission and seals out ambient noise while preventing the cracking and wearing that can occur from repeated use. The longer-than-average length allows a comfortable space between health professional and patient.