Electronic Stethoscope With MEMS Microphone and Recharchable LiPo Battery : 7 Steps - Instructables
Akash Thakkar on Twitter: "Using my stethoscope microphone setup to record some impact sounds for Hyper Light Drifter! http://t.co/fty5YuKlwO" / Twitter
Spy Sound Pick-up Wall Microphone Voice Bug Engine Stethoscope Through Wall Door | eBay