Audix TM-1 Plus - test and measurement microphone for RTA and room analysis software systems, frequency response: 20Hz-25kHz (+/-2dB), 200ohm impedance, 140dB maximum SPL, nickel housing, requires 18-52V phantom power. incl. windscreen (WS-TM1), elastic holder (SMT-19), 1"2-adapter for calibration (TM1-CA) and individual sensitivity /calibration-data-File on CD