The embodiments of the invention disclosed are configured with a voice translation software, and can be readily used after switching off the microphone of the mobile phone and inserted into the charging port of the mobile phone. In some embodiments, the invention comprises two microphones; when the mobile phone is directed at a speaker, the audio pickup is performed by using a “hypercardioid noise-filtering microphone”, and when the mobile phone is directed at oneself, the audio pickup is performed by using a “cardioid noise-filtering microphone”, such that the surrounding noises can be prevented from being picked up in order to achieve an accurate and fluent voice translation. In other embodiments, when the microphone is used to ask for directions or in communication while travelling abroad in particular, this use enables the user to keep an adequate distance from the opposite party in keeping with the international social etiquette.