Cardioid condenser boundary microphone with switch phantom power only, Frequency Response 30 - 20,000 Hz, Open Circuit Sensitivity -34 dB (19.9mV), Impedance 200 ohms, Max. Input Sound Level 134 dB SPL, Dynamic Range 104 dB, S/N Ratio 68 dB, UniGuard® RFI shielding technology Phantom Power 11-52V DC, 2 mA typical, Weight 264g