Sennheiser MKH20 Omni Microphone, from Sennheiser

Current Consumption: ........ 2 mA
Pick Up Pattern: ........ Omnidirectional
Frequency Response: ........ 12 - 20,000 Hz (-3 dB)
Sensitivity: ........ 25mV/Pa (8mV/Pa +-1dB)
Nominal Impedance: ........ 150 ohm
Min Terminating Impedance: ........ 1000 ohm
Equivalent Noise Level: ........ 10 dB (18 dB) / 20 dB (27 dB)
Max Spl: ........ 134 dB (142 dB)
Dimensions: ........ 25mm x 153 mm
Weight: ........ 100 g
Transducer Principle: ........ Pressure microphone
Max Output Voltage: ........ 2.5V

Omni directional condenser microphone

Features
-Microphone with omni-directional pick-up pattern
-Exceptionally low inherent self-noise
-Exceptionally flat frequency response, switchable for near and diffuse field applications
-High frequency response can be accentuated by means of a special pressure build-up ring
-Slightly increasing directivity at high frequencies to adjust tonal balance
-High sensitivity
-Switchable pre-attenuation