Thinklabs One Digital StethoscopeThinklabs One Features: The smallest, most powerful stethoscope in the world Fits in the palm of your hand Amplifies over 100X Uses audio headphones Description: The icon of medicine has changed. The One has a standard 3. 5mm jack so you can connect high quality headphones instead of old tubing style binaurals. You get better sound, more comfort, a more compact stethoscope and the choice to use the headphones of your choice. Order includes Thinklabs