... and GND Cable 3 x 0.5mm2 RVVP cableVoltage DC 12V (8 ~ 20V) Current 17 mATemperature -25°C ~ 70°CColor ... & monitoring microphone.*Low noise, Low echo, clear speech, low price.*Built in digital audio disposal circuit , two step dynamic de-noise disposal ... RVVP cable, 4 core phone line, network twist line, etc.*Built-in over-loading protection and lightning proof circuit.*Pre-amplifier, directly ...