3M Littmann Select With Instruction Manual The thin bell makes it easy to auscultate during blood pressure measurements. By varying the pressure applied to the chestpiece against the skin, you can switch between low-frequency and high-frequency modes, allowing for continuous auscultation of low and high frequencies without changing the chestpiece side. I purchased this item, which was listed as new and unused. I have tested it at home to confirm auscultation. I am a healthcare professional, and the auscultation is fine. Disinfected with alcohol wipes before listing. Useful not only for healthcare professionals, but also for listening to children's lung sounds and for early detection of aspiration pneumonia in home care. Will be shipped in simple packaging. #Stethoscope #NursingStudent #Nurse #Nursing #Littmann #Caregiving #Facility #FetalHeartSounds #Doctor #Clinic - Brand: Littmann - Model: Select - Color: Black Thank you for viewing.