Haynes is one of the most highly recognised publishing and specialist automotive brands in the world. As the world's leading publisher of car and motorcycle manuals, it has become an instantly recognisable classic British brand with worldwide distribution. Haynes have now put their name to a range of electronic model building kits, which make the perfect gifts for any self-assembly fans, electronics geeks and lovers of all things retro Each kit comprises all the components needed to create your own version of classic electronic devices and comes with a clear and concise instruction guide in the style of a Haynes manual. The Haynes electronic model building kits are perfect starter projects for aspiring creators and can serve as a wonderful learning tool for those who love electronics and how they work. Who says you can't hear bats? With the Haynes Build Your Own Bat Detector Kit, you can turn the ultrasonic calls of bats into audible sounds. Once built, you will have your very own handmade high-quality ultrasonic detector perfect for tracing these fascinating flight artists. Housed in a cardboard picture box, the completed device will detect not only the sound of bats but also a host of technical devices that emit ultrasonic sounds. You will be surprised how many inaudible acoustical sources surround us Boost your ears: 20 kHz is not enough Easy to assemble, with all components and relevant wiring included, you do not require a solder to create your own bat detector. Runs on a single 9V battery (not included). Please note, colours and contents may vary from those shown.