You can't hear the calls of bats? With the right technical tools, and not just that. Build your own high-quality ultrasonic detector and experience it yourself! Make the animals' ultrasonic waves audibleThis kit makes this a light and fail-safe exercise: The board is already equipped with numerous SMD components. You only need to solder in a few parts yourself and wire the circuit board with microphone, loudspeaker and the setting controls. Modern integrated circuits ensure high sensitivity and volume.Bats also exist in places where they would not have been suspectedAnd then you can go on a journey of discovery: With the finished detector, the ultrasound calls of bats can be made audible. In this way you can track these fascinating flight artists in the dark even where they are otherwise completely unnoticed in the hunt for insects. But not only bats, but also numerous technical devices send out ultrasound. You will be surprised by how many inaudible sources we are surrounded by. Give