Omnidirectional fixed charge condenser boundary microphone, Frequency Response 40 - 18,000 Hz, Open Circuit Sensitivity -42 dB (7.9mV), Impedance 200 ohms, Max. Input Sound Level 142 dB SPL, Dynamic Range 112 dB, S/N Ratio 64 dB, Phantom Power 11-52V DC, 2 mA typical, Weight 63g