LOT OF 2 Astatic 636L Noise Cancelling CB Radio 4 pin Microphone Noise Cancelling Dynamic Microphone (for close talking) Heavy duty coil cord extendes to 71/2 feet. Wired with 4-pin plug for Cobra, Uniden & Galaxy etc. Can be wired to any 3,4,5 or 6 pin wire system Frequency Response: 100 - 5000 ohms. Output Level: -56dB. Impedance: 400 ohms , matches 50 to 1000 ohms THIS LISTING IS FOR A QUANTITY OF 2