Meet the 3M Littmann CORE stethoscope: an iPhone compatible stethoscope that connects to the Eko iOS /Android app to visualize your heart sound waveforms. It has 40x amplification and active noise cancellation. This stethoscope has analog and amplified listening modes.
You can use this tool to save 15, 30, 60 or 120-second recordings. It comes with a soft-sealing ear tips and dual sided stainless steel chestpiece.[where to get it]