Build Your Own Bat Detector: What is it? It\'s a simple but oh-so-cool kit that lets you build a bat detector, which means you\'ll be able to listen to bats and other ultrasonic animals! About the product It comes in kit form, but building it is super easy. Much of it comes pre-assembled and the other parts fit together with simple connections that don\'t need soldering or anything like that. Once it\'s built, you\'ll be able to set the frequency and volume and listen for bat signals through the speaker! How is it powered? It\'s powered by a single 9V battery, which isn\'t included. Why you should buy it Buy it because it lets you tap into a whole world that\'s out there, but that you just can\'t hear! Order your Haynes Build Your Own Bat Detector Kit now! | Haynes Build Your Own Bat Detector Kit