PMMN4045B Remote Speaker Microphone, equipped with a 3.5mm audio jack. Its standout Noise Cancelling feature significantly reduces background noise, ensuring crystal clear communication. This microphone's unique design allows audio to transmit even when water blocks the port. This convenient RSM offers the ability to speak and listen without needing to remove the radio from your belt or case. It's fully compatible with Motorola Solutions XTS Radio Series.