Royer Labs R-121 MP, Matched Microphone Pair, Directional characteristics: Figure 8, Extremely low noise, Ribbon element insensitive to heat and moisture, Ideal for guitars, wind instruments, overheads and strings, Transmission range: 30 Hz - 15 kHz / - 3 dB, Sensitivity: -54 dBv re. 1 V / pa / - 1 dB, Output Impedance: 300 Ohm @ 1 k (nominal), Maximum sound pressure: >135 dB, Length: 158 mm, Diameter: 25 mm, Weight: 245 g, Colour: Nickel, Incl. Wooden case and protective cover