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Voice-Changing Bowtie (蝶ネクタイ型変声機, Chō Nekutai Gata Henseiki) is a voice changing necktie machine created by Hiroshi Agasa which can change the voices of everyone the holder wants. It works on a frequency modifier system based on patterns from the voice it is to emulate. Conan mostly uses it to mimic Kogorō's voice or anyone else that is closely to him. If Conan isn't seen with the voice changing bow-tie, he stores it in his pocket.