Below is from the manufacturer. I have only used this stethoscope twice! perfect condition, I still have the box and extra set of ear pads. I just don't like it because it's too heavy for me to wear around my neck all the time. Choose a Classic The compact 3M Littmann Classic III Stethoscope is perfect for monitoring and assessing children or adults in non-critical settings. The versatile stethoscope offers high acoustic sensitivity for exceptional performance, hours of comfortable use and comes in a variety of vibrant colors to reflect your personal style. Use in non-critical settings Detect normal and abnormal sounds and rhythms Fun and vibrant; match color and finish to your personality Tunable diaphragm Tunable diaphragms on both the adult and pediatric sides of the chestpiece. The pediatric side is useful for small or thin patients, around bandages, and for carotid assessment Single-piece diaphragm Single-piece diaphragm is easy to attach and easy to clean because the surface is smooth without crevices. Open bell Open bell stays clear of dirt and debris by covering it with the small diaphragm. Next-generation tubing Not made with natural rubber latex or phthalate plasticizers in the tubing or any other component. 5 year promise Turn to your trusted instrument for years to come with a five-year promise. Made in the USA.