New GENUINE Uniden microphone. Replacement 4 pin microphone for the Uniden Pro510XL and Pro520XL radios*. Rugged construction with high quality original Uniden microphone. FACTORY NEW! 

SPECIFICATION:
Element Type: Electret 
Impedance: 500 ohm

NOTE: Electret elements requires voltage from radio. Not compatible with radios with dynamic microphones. Please contact us to verify if a electret condenser microphone is compatible with your radio. 

WIRING:
PIN 1 - Shield / Ground
PIN 2 - Audio
PIN 3 - TX PTT
PIN 4 - RX

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