Acoustic Vector Sensor is a super small microphone which can hear and identify any sound.

A Dutch firm, Microflown Technologies, has created a micro device which listens for various sounds emanating from a battle field, such as gunshots, mortars, screams and warplanes. The Acoustic Vector Sensor is smaller than a match head and consists of two platinum strips.

Popsci reports more on the working of this device:

By measuring the mechanical movement of individual air particles, as opposed to sound waves as a whole, the device can not only pinpoint the origin of sniper fire or approaching aircraft, but detail their make and model, as well.

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