Audio-Technica ATM75CH

With a pivot-mounted flexible boom that can be positioned on either the left or right side of the head, the ATM75 headworn microphone delivers professional-quality vocal pickup with hands-free operation. Includes AT8139L large windscreen, AT8139S small windscreen, and AT8439 cable clip.
Available configurations:

ATM75cH: 55" (1.4 m) permanently attached miniature cable terminated with a screw-down 4-pin connector for use with Audio-Technica cH-style body-pack wireless transmitters.  

Professional-quality vocal pickup with hands-free operation
Low-visibility headband provides stable, comfortable fit
Pivot-mounted flexible microphone
Cardioid polar pattern improves isolation of desired sound source

Element Fixed-charge back plate, permanently polarized condenser
Polar Pattern Cardioid
Frequency Response 100 - 13,000 Hz
Low Frequency Roll Off 80 Hz, 18 dB/octave (wired only)
Open Circuit Sensitivity Phantom: -51 dB (2.8 mV) re 1V at 1 Pa
Battery: -53 dB (2.2 mV) re 1V at 1 Pa
Maximum Input Sound Level Phantom: 132 dB SPL, 1 kHz at 1% T.H.D.
Battery: 121 dB SPL, 1 kHz at 1% T.H.D.
Dynamic Range Phantom: 96 dB, 1 kHz at Max SPL
Battery: 85 dB, 1 kHz at Max SPL (wired only)
Signal-to-Noise Ratio 58 dB, 1 kHz at 1 Pa
Phantom Power Requirements 11-52V DC, 2 mA typical
Battery Type 1.5V AA/UM3
Battery Current/Life 0.4 mA / 2000 hours typical (alkaline) (wired only)
Switches Off, on-flat, on-roll-off (wired only)
Weight Microphone: 60 g (2.1 oz)
Power module: 139 g (4.9 oz)
Cable 4.6' (1.4 m) long (permanently attached to microphone), 0.11" (2.8 mm) diameter, 2-conductor shielded cable (termination dependent)
Dimensions Microphone: 20.4 mm (0.80") diameter
Power module (wired only): 84.0 mm (3.31") H x 63.0 mm (2.48") W x 22.0 mm (0.87") D
Headset: 120.0 mm (4.72") nominal at widest point, 80.5 mm (3.17") flexible boom
Output Connector Power module: Integral 3-pin XLRM-type (wired only)
Accessories Included AT8531 power module (wired only); AT8439 clothing clip; AT8139L large windscreen; AT8139S small windscreen; battery (wired only)