FeaturesBuild a powerful listening devicePerfect for animal voices and quiet noisesNo previous experience is requiredConstruction is completed with no solderingNot suitable for children under 14 years of ageAlways listening! With this Franzis Build Your Own Spy Microphone Kit, you can easily build a powerful listening device that is perfect for animal voices and quiet noises.The manual clearly guides you through the assembly. No previous experience is required. Ideally suited for all hobby investigators and tinkerers interested in technology. Construction is completed with no soldering.Additionally required: 9 V block battery, headset with 3.5 mm jack plug.Not suitable for children under 14 years of age.