How to make a high-tech spy stethoscope Hear through walls with this high-tech spy stethoscope for under $25.
Tags: spy stethoscope
Hear through walls with this high-tech spy stethoscope for under $25.
That's really cool... Is there any way to boost the power (or whatever you'd call it in a stethoscope) in the stethoscope? and are two microphones necessary?
i luv the sam stop calling here part! very funny. good job on the ear phone part too!
