AMS-611L: The 611L dynamic microphone is designed for palmheld communication. The frequency response, especially tailored for voice communications, provides a crisp, clear, highly intelligible sound. The 611L handheld mic, with modern tear drop styling, offers extreme reliability, convenient handling, rugged construction and high performance for years of dependable service. The dynamic cartridge has a strong polyester diaphragm that resists moisture, temperature extremes, most acids, alkalines, and solvents. Molded in high impact Cycolac, the Astatic 611L comes with a permanently attached, heavy-duty, four-conductor, double-shielded, coil cord. The low impedance 611L has a DPDT long life, trouble-free switch and is factory wired normally open.