Cardioid Condenser Boundary Microphone with Switch, , Open Circuit Sensitivity -34 dB (19.9mV), Impedance 50 ohms, Max. Input Sound Level 130 dB SPL, Low Frequency Roll Off 80 Hz, 18 dB/octave, Dynamic Range 104 dB, S/N Ratio 68 dB, Phantom Power 11-52V DC, 2 mA typical, Weight 253g