Audio-Technica ATM73CH

Ideal for drummers, keyboard players or anyone requiring hands-free operation, the ATM73 cardioid condenser headworn microphone features a comfortable, unobtrusive headband design with side-of-mouth pickup.
Available configurations:

ATM73cH: 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.

Ideal for drummers, keyboard players or anyone requiring hands-free operation
Comfortable, unobtrusive headband design with side-of-mouth pickup
Belt-mounted power module operates on battery or phantom power
Cardioid polar pattern improves isolation of desired sound source

Microphone
Element Fixed-charge back plate, permanently polarized condenser
Polar Pattern Cardioid
Frequency Response 40 - 15,000 Hz
Signal-to-Noise Ratio 59 dB, 1 kHz at 1 Pa
Weight 31 g (1.1 oz)
Cable 55" (1.4 m) long (permanently attached to microphone), 0.10" (2.6 mm) diameter, 2-conductor shielded cable (termination dependent)
Dimensions 
Microphone: 10.0 mm diameter
Headset: 165.0 mm nominal at widest point, 67.0 mm (2.64") flexible boom
Accessories Included
AT8128 windscreen; AT8125 windscreen