Uniden BWZH1889001. The BWZH1889001 adapter facilitates the use of a 4-pin microphone on Uniden's newer 6-pin radios. Notably, the President Lincoln II mandates a high impedance microphone or an amplified microphone for optimal performance, with 500 ohm microphones like the Astatic 636L being incompatible due to incorrect impedance.
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