Andrea Communications C1-1025400-1 Model ANC-300 Hand-Held Computer Microphone, Dual functionality, Three position selector switch (Near Field (Hand-held), Far Field (Desktop) or Mute)
Andrea Communications ANC-300 Microphone enables more accurate and reliable communications and offers high performance speech recognition in noisy office environments.

Key Features
Active noise-canceling (ANC) microphone uses acoustic mic technology for superior performance with desktop speech-enabled applications
Dual functionality - Use wither as a hand-held microphone for speech dictation or on the desktop stand for multi-party conferencing
Three position selector switch (Near Field (Hand-held), Far Field (Desktop) or Mute)
Microphone windsock minimizes breath popping
Extra-long shielded cable with 3.5mm single plug

Specifications
Noise Cancellation: 6dB/octave
Frequency Range: 100-10,000 Hz
Impedance at 1kHz: 650 Ohm
Electrical Signal-to-Noise Ratio: 60dB
Sensitivity at 1 kHz (0 dB = 1 V/Pa): -28dB
Current Consumption: 0.800mA