Labtec LVA7330 ClearVoice Head Microphone (Discontinued by Manufacturer)
Includes: Unidirectional NCAT2 microphone for accurate voice input, fully adjustable headband for easy positioning, mute control, 8' shielded cord w/3.5mm gold plug, microphone sensitivity: -56DB V/uBar, -36DB V/Pascal +/-4DB, microphone power source voltage: 1.5V DC, impedance: 2000 OHMS, frequency response: 100 - 16,000Hz.