Check the listing for details. Driver Extreme DX656 Noise Canceling Dynamic Communications 4-pin Microphone. Condition: New. Listed at 69.99 USD. Driver Extreme DX656 Noise Canceling Dynamic Communications Grade 4-pin Microphone Enhance your radio communication experience with the Driver Extreme DX656 Noise Canceling Dynamic Communications 4-pin Microphone. This high-quality microphone is designed to provide clear and precise communication, even in noisy environments. It is compatible with Cobra and Uniden devices and features a 4-pin connectivity option for easy installation. With its advanced noise cancellation technology, this microphone ensures that your conversations are crystal clear, without any unwanted interference. Whether you're a professional truck driver or a hobbyist, this microphone is a must-have accessory for your radio communication equipment. Get your hands on the Driver Extreme DX656 Noise Canceling Dynamic Communications 4-pin Microphone today and enjoy reliable and efficient communication on your next adventure. Ergonomic design and contoured switch for comfortable feelRugged chrome plated grillExtra-long strain relief for durabilityHigh quality 9 foot cordAcoustically tuned for natural sound and clarityInternal diffuser to eliminate breath popsStandard 4 pin 6 conductor wiring Pin 1 (Ground) Shield & Blue Pin 2 (Audio) White Pin 3 (TX) Red Pin 4 (RX) Black Yellow wire is unusedType: Dynamic noise cancelling systemSensitivity: -54 dB +/- 3dB (1V/Pa @1 KHz) Measurable impedance: 500 ohm’s +/- 30 ohm’s Frequency response: 55 Hz – 7 KHz (proximity effect compensated)No battery or power source required