FeaturesEasy Build Bat DetectorAssemble your own premium ultrasonic detectorEasy build kit circuit board - no soldering requiredListen to the sound of bats as well as other things that emit ultrasoundRequired: 9V battery, not includedThe Franzis Build Your Own Bat Detector Kit lets you build your own high-quality ultrasonic detector.This kit makes finding bats simple. The board is already equipped with numerous SMD components. You only need to connect a few parts yourself and wire the circuit board with microphone, loudspeaker and the setting controls. Modern integrated circuits ensure high sensitivity and volume. You can then go on a journey of discovery.Make the animals\' ultrasonic waves audibleWith the finished detector, the ultrasound calls of bats can be heard. In this way you can track these fascinating creatures in the dark.Its not only bats, but also numerous technical devices send out ultrasound. You will be surprised by how many inaudible sources we are surrounded by.Required: 9V battery, not includedNot suitable for children under 14 years