A microphone may be used.Logical formLearned from20 sentences. Microphones can be secret.Logical formLearned from20 sentences. A headset can be with a microphone.Logical formLearned from20 sentences. A female may say into a microphone.Logical formLearned from20 sentences. Microphones may work.Logical formLearned from20 sentences. A male may say into a microphone.Logical formLearned from20 sentences. A microphone can be calibrated.Logical formLearned from19 sentences. Microphones may be placed.Logical formLearned from19 sentences. Microphones may be used.Logical formLearned from19 sentences. A person may buy a microphone.Logical formLearned from19 sentences. A male may yell into a microphone.Logical formLearned from19 sentences. A person may place a microphone.Logical formLearned from19 sentences. A guy can be with a microphone.Logical formLearned from19 sentences. A male may put a microphone.Logical formLearned from19 sentences. A male may approach a microphone.Logical formLearned from19 sentences.