Sennheiser MM 445, Dynamic Microphone Capsule, Polar pattern: Super cardiod, Frequency range: 40 - 20,000 Hz, Max. SPL: 163 dB, Impedance: 245 Ohm, Open circuit sensitivity: -55.9 dBV/Pa (1.6 mV), Spring-mounted capsule for shielding from structure-borne sound, Dimensions (length x diameter): 174 x 47.5 mm, Weight: 329 g@+@+*Compatible with:*@+, Digital 6000 (SKM 6000), Digital 9000 (SKM 9000), 2000 Series (SKM 2000), Evolution Wireless G4 (SKM 300 G4, SKM 500 G4)@+@+*Not compatible with:*@+, Evolution Wireless G4 (SKM 100 G4), Evolution Wireless G3, XS Wireless, 5000 Series, AVX, SpeechLine DW