Xtenzi Microphone External Bluetooth Mic Assembly for Boss BV9958B BV9372BI BV9380B BV9364BI Car DVD Nvigtion Xtenzi Brand Replacement mic Microphone for Boss Audio System car sterio kit, Adopting electret condenser cartridge with high sensitivity , low impedance , anti noise and ant jamming capability , it's highly improved the speech quality of hand free car kit communication system. Easy to install with double sided tape and mount, 3Meter Long cable,Standard Operation Voltage: 4.5V Operation Voltage: 1.0V-10V.DC Compatible With Models: BV9958B BV9372BI BV9380B BV9364BI