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Listen to nature with modern electronics!Human ears cannot hear the cries of bats? With the right equipment, you can – and you can do much more.Make your own premium ultrasound detector and experience it yourself! With this construction kit, this will be an easy exercise that cannot go wrong. The kit contains a circuit board that is already equipped with various SMD components. You only have to solder some elements yourself and wire the circuit board with the microphone, the loudspeaker and the adjusters. Due to modern integrated circuits, the detector will be very sensitive and powerful.Once it is built, you can start exploring and discovering: with the detector, the bat's ultrasounds can become audible for humans. That way, you can trace those little flight artists in complete darkness even at places where they would hunt for insects without being noticed. But not only bats send ultrasounds, there are also many technical devices which do the same. You will be surprised at the number of various inaudible ultrasounds that surround us. Give your ears super powers. 20 kHz are not enough.Required Soldering iron 9 V battery

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For your next Undercover Mission With this technological gadget, your voice is guaranteed to remain unrecognizable. The voice changer modifies the frequencies of your voice so that even your best friends won't recognize it. The ideal tool for remaining 'undercover' or playing a prank! Additionally required: 1 x 9 V battery

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Always Listening With this kit, you can easily built a powerful listening device that is perfect for animal voices and quiet noises. The manual clearly guides you through the assembly. No previous experience is required. Ideally suited for all hobby investigators and tinkerers interested in technology. Additionally required: 1 x 9 V battery Headset with 3.5 mm phone jack

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