This kit makes finding bats an easy and fail-safe exercise: The board is already equipped with numerous SMD components. You only have to put together a few parts yourself and wire the board with microphone, loudspeaker and the setting controls. Modern integrated circuits provide high sensitivity and volume. With the finished detector, the ultrasound calls of bats can be made audible. This way you can track down these fascinating flying artists in the dark even where they are otherwise completely unnoticed in the hunt for insects. Requires one 9V battery (not included). Construction complete without soldering! This is not a toy! Not suitable for children under 14 years of age.