Ultrasonic detector stereo

This detector converts imperceptible sounds for humans such as bat signals into audible noise.
Another usage may be the early detection of possible failures in machines, engines and electronics.
The stereo feature adds the possibility to pinpoint the source.

Specifications

type: heterodyne
microphones: electret
frequency range: 20 - 90 kHz
power supply: 3 x 1.5 V AA batteries (not incl.)
power consumption: 8 mA typ.
size: 129 x 60 x 40 mm
weight: 135 g with batteries
output: 3.5 mm jack for headphones (headphones not incl.)