I want to know the answer to the following question:
What did Madonna use in her concerts?
All the background I'm provided with is that "To allow for greater movement while dancing and singing, Madonna was one of the earliest adopters of hands-free radio-frequency headset microphones, with the headset fastened over the ears or the top of the head, and the microphone capsule on a boom arm that extended to the mouth.". Is that enough to answer the question?