HE Series headset microphone is ideally suited for vocal sound and speech application which  requires much freedom of movement.
    L1: Standard 3.5mm single(double) plug
    L2: SENNHEISER type 3.5mm stereo plug
    L3: Special thread type 3.5 single plug
    P3: AKG type 3pin mini XLR(3p)or other
    P4: SHURE type 4pin mini XLR(4p)or other

Element…………………..… Back Electret Condenser
Polar Pattern…………….…Uni-directional
Frequency Response…….50Hz- 16KHz
Sensitivity……………….….-45dB± 3dB
Output Impedance……….2200Ω± 30%
Max.Input SPL……………130dB
S/N Ratio……………………>70dB
Power Supply………………1.5V-10V
Cable…………………………Φ2*1.2M
Dimension……………………Φ12mm
Color…………………………Black
Accessories………………….Windscreen