3M Littmann Cardiology III Stethoscope, Rainbow-Finish Chestpiece, 27" Length, Lavender Tube The only dual-sided chestpiece in the Cardiology line provides versatile auscultation for both adult and pediatric patients Two tunable diaphragms respond with a simple pressure change to capture low and high-frequency sounds Expand versatility by converting pediatric side to open bell for low frequencies, using the nonchill bell sleeve (included) Two-in-one tube design (dual lumen) eliminates noise from two external tubes rubbing together Anatomically designed headset is angled to meet the path of the ear canal Double-sided chestpiece for adult and pediatric auscultation Pediatric side can be converted to an open bell for low frequencies using non-chill bell sleeve (included) Pressure-based sound frequency adjustment with tunable diaphragm Parallel noise-reducing sound channels in the tubes