The Littmann Master Cardiology 2160 Stethoscope is praised and acclaimed greatly by all medical practitioners who have owned and used it. For good reason too! This product has an array of amazing features that makes it one of the most attractive buys ever. The product comes with a 7 year manufacturer’s warranty period. Littmann’s highest acoustic performance is delivered in this chest piece, so you will hear every little sound when you are diagnosing your patient. The two in one tube design will make sure no noise interferes because of the tubes rubbing together.