The Eko CORE™ Digital Attachment is a Bluetooth-enabled device that attaches to and enhances a traditional stethoscope, allowing you to get more from the device you already own. It's compatible with most adult and pediatric stethoscope models from 3M™ Littmann®, ADC, WelchAllyn, MDF, and Medline. -A must for anyone who uses a stethoscope! -Condition: LIKE NEW without flaws or signs of wear with original box, all connectors, usb charging cable, and user manual.