Shure SM10ACN Headset Mic

Close-talk design provides excellent isolation and minimizes gain-before-feedback.
Extremely rugged with fully adjustable headband and microphone boom.
Cardioid dynamic
Frequency response: 50 to 15,000 Hz
About Shure
S.N. Shure began his company’s relationship with the products of personal sound by launching a one-man operation in 1925 that sold radio parts kits. Since then, Shure microphones and audio electronics have been the tools of choice for politicians, musicians, corporations, churches, and broadcasters across the world. Anyone who considers sound to be an important part of his or her self-expression has probably used one of Shure’s microphones, phonograph needles, or other professional audio products.

Technical Description:
Type: Dynamic, close-talk
Frequency Response (at 8mm [5/16 in.]): 50 to 15,000 Hz (see Figure 2)
Polar Pattern: Cardioid, uniform with frequency, symmetrical about axis
lmpedance: Rated at 150 W (223 W actual)
Sensitivity: 1,000 Hz at 8mm (5/16 in.)
Open Circuit Voltage: -65.0 dBV/Pa* (0.45 mV)
*1 Pa = 94 dB SPL
Hum Sensitivity (typical): 35.5 dB equivalent SPL in a 1 mOe field
Polarity: Positive pressure on diaphragm produces positive voltage
on pin 2 of microphone connector
Connector: Professional 3-pin male XLR audio connector
Cable: Non-detachable, 1.5 m (5 ft.), 2-conductor, shielded, plastic-jacketed
Case: Black thermoplastic microphone and pivot housing, anodized aluminum end caps, stainless steel grille, and boom