Features Self-assembly technological gadgetVoice changer modifies the frequencies of the voiceEven your best friends will not recognise itConstruction is completed without solderingNot suitable for children under 14 years of ageFor your next undercover mission! With the Franzis Build Your Own Voice Changer Kit, your own voice is guaranteed to remain unrecognisable. The voice changer modifies the frequencies of the voice so that even your best friends will not recognise it. Construction is completed without soldering, this is the ideal tool for remaining undercover or playing a prank!Additionally required: 9 V block battery.Not suitable for children under 14 years of age.