Eight Innovation EBD2766 Build Complete Construction Kit to Create Your Own Fully Functioning Bat Detector, One Size, for 14 and Above, 1 pieces, Blue

Assemble your own high quality ultrasonic detector! Give your ears superpowers and listen to amazing new sounds! Clear, step-by-step instruction booklet Easy-build kit – simple push-fit connectors and screw-together parts Requires 1 x 9V battery (not included), Manufacturer: EIGHT GREAT STUFF TO MAKE 2008