< >NEW Workman DM-452-4 dynamic power microphone with echo. Wired for 4 pin Cobra, Galaxy, Uniden, and other CB radios*. Front adjustable echo level control. Interior adjustable gain control. Requires 9V battery (not included). Radio monitor should be turned off and internal microphone gain control adjusted to prevent feedback squeal .< >NOTE: This microphone is NOT compatible with the Cobra 19 Ultra III, 19 LTD II, Uniden Pro 505XL, Pro510XL, Uniden Pro520XL, and other radios that have condenser "gray-bar" style electret microphones. These radios supply a voltage on the audio line which interferes with the circuitry of the power mic.< >SPECIFICATIONS:< > Sensitivity: -70+/- 3dB (at 1KHz)
Impedance: 500 ohm
Frequency Response: 300~6KHz< >WIRING:
PIN 1 - Shield / Ground
PIN 2 - Audio
PIN 3 - TX PTT
PIN 4 - RX