Sennheiser DRM85 Flashmic Digital Recording Omnidirectional Microphone Bitrates (MPEG) 384, 256. 192, 128 kbps Frequency Response 20 Hz - 20 kHz  1dB @ 48 kHz FS Linear PCM Microphone Capsule Omni-directional High Pass Filter Switchable on/off, 12 dB/octave @ 100Hz File Format Linear PCM: .wav, Broadcast Wave File (BWF). MPEG 1 Layer 2: .mp2, ISO/IEC-11172-3. Date / Time stamp is stored in file header. Filename generated automatically by DRM85, basic text string provided from PC software