This headset comprises a noise cancelling electret microphone, single ear cushion with liquid filled sealing ring that can be replaced by hand, making it easy to service in the field. The PTT (push to talk) button is located on the left ear-cup. The boom microphone can be rotated through 270 degrees meaning the headset can be worn on either left or right ear. Various radio leads can be connected to the headset by way of a quick release XLR connector. The radio leads are available with direct connection to your chosen radio, or through an in-line Body PTT switch. This is an ideal solution if you have multiple types of radios in use.