Motorola RMN5089B Commander II Remote Speaker Microphone (Black) Remote Speaker Microphone features Wind porting Technology - which dramatically lessens background noise in windy and other severe weather conditions Audio can pass through the speaker grill even when the microphone port is wet, ensuring clear communication at all times This microphone offers a channel selector and 3.5mm audio jack Compatible, MT 1500, PR1500, XTS 1500, XTS 3000, XTS 3500, XTS 5000