Carbon Fiber Edition World famous radio mic. Double chrome plated grille screen. Dynamic noise-cancellation. maximum talk power. Heavy-duty construction. 4 pin broches. Double chrome plated grills screen with soft vinyl lip grip. flexible, heavy-duty coil cord extends to 7-1/2 feet. The astatic model 636l noise-canceling dynamic microphone is ideal for cb, amateur radio and ssb communications. It fits all 4-pin radios, and effectively reduces wind and vehicle noise. Durable construction is combined with a polyurethane-coated steel grille and soft vinyl lip guard. Our exclusive heavy-duty coil cord extends to 7-1/2 feet. Astatic's tailored frequency response provides maximum talk power. Specifications: Type: Dynamic noise-canceling. Freq. Resp: 100 to 500 Hz. Output Level: -58 dB (0 dB= 1 mw/10 microbars), -76 dB (0 dB= 1 volt/microbar). Impedance: 200 Ohms (match any radio). Cable: Six wire, five conductors, one conductor shielded, coil cord with durable strain relief. Connector: 4-pin female locking ring connector. Switch: DPDT smooth operating, long life, trouble free switch with spring return. Housing: Durable molded black ABS Cycolac. Pin 1 - shield & blue (ground & common). Pin 2 - white (audio). Pin 3 - red (PTT transmi). Pin 4 - black (recieve control). www.astaticmics.com.