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How to Make a high-tech spy stethoscope

Cat being examined with a stethoscope.

A stethoscope, often considered the symbol of a doctor's profession, but also used by safe-crackers and auto mechanics to hear sounds that otherwise couldn't be heard. Well, it's time to make a high-tech electronic spy stethoscope with Kip Kay in this gadget video tutorial, for only twenty-five bucks! You can hear and record heartbeats with this spy gadget, or even listen through walls!

Materials needed: stethoscope, pair of multi-media microphones (for the mini condenser mics) drill, hot glue, mini-stereo Y-adapter, and a digital recorder or MP3 player/recorder.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check our list of supported iPhone and iPad models, then follow our step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.

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