Brandmotion 5000-PESMVR Replacement Microphone Kit with Voltage Regulator Microphone Accessory Kit for Rear Vision Mirror Upgrades for Vehicles with Factory Microphones Precision-Tuned and Guaranteed to Produce the Same High Quality Conversation Quality Works with Your Vehicles Factory Hands-Free Communication System Includes a Voltage Regulator Which Keeps the Microphone Safe During Voltage Fluctuations Self-Contained Housing Mounts Where You Want It, On the Headliner or On the Windshield Pillar