The D104-M6 series microphones are quality performance field effect amplified “power"" microphones for amateur, citizen band, mobile, aircraft, marine applications, The housing of the D104-M6 is molded black ABS with a chrome plated grille screen, An output impedance compatible with the inputs of almost all commercial transceivers and externally adjustable high gain amplifier ensures desired modulation level, The D104-M6 has an easily accessible control for volume so that the correct modulation level can be set for each operators voice, The preamplifier is powered by a readily available, easily replaced, 9 volt battery, It has a six wire coil cord which allows for relay, electronic or virtually any type hookup with almost any transceiver, The audio line is open during receive, This mic is wired 4 pin Cobra/Uniden/Midland/Galaxy, SKU: CBDST2858