The kit consists of two wireless microphones that transmit sound and a phone plug-in that receives the sound from the mics. There is also a charging case that holds all the items and charges the batteries in the microphones. (The receiver gets its power from the phone and does not have a battery.) The kit can also be used with other apps that record audio. The HeardThat microphone kit works with the HeardThat app and can be used in many ways to remove noise from speech.