The Special Projects SP-H20 headset is designed for the active professional requiring hands-free communication in environments where a waterproof microphone is needed. Applications range from live performances, aerobics instruction, sports casting, television reporting, and anywhere there is a need for voice amplification in the presence of moisture. The SP-H20 is sealed for protection against rain, dust and perspiration. The SP-H20 comes standard with two detachable cables. The gooseneck boom permits precise placement under the lips and stays in place during physical activity. Hirose 4-pin connector.