Details: Motorola PMMN4051 Remote Speaker Microphone – 3.5mm Audio Jack, IP54, Windporting – M23. The Windporting feature of this microphone helps lessen background noise from high winds and other severe weather conditions. Audio can pass through the speaker grill even when the microphone port is blocked by water. Now public safety professionals can be more confident than ever of clear, understandable communication when Mother Nature is uncooperative. The Windporting Remote Speaker Microphones allow talking and listening without removing the radio from the belt or case.