I bought this not knowing a friend had one for me. So it’s brand new, never even tried. I’d opened the box before she could tell me not to. I would have returned it, but at least on Poshmark someone will get one at a lower price than I paid. 👍 Here are the specs: * Channel into a wide range of frequencies with this stethoscope’s tunable diaphragm, and keep yourself and patients comfortable with its lightweight build and non-chill chest piece. * Tight-seal eartips let you capture sound without interference, and the adjustable headset makes it easy for you to find that perfect fit. Not only is our durable, single tubing latex and phthalate free, it transmits far less noise interference than a traditional double tubing. * Every single pair is tested for acoustic integrity in our factory. Included in the box are a set of replacement eartips, as well as a replacement diaphragm. Additionally, if you need those pieces replaced for any reason, give our customer service team a call, and they’ll send you new ones.