Racing track noise reduction ear-muff headset for 2-way radios

SPECs:

Earphone:
Size  Outer Diameter 50mm
Weight  14.8 gram
Magnet  Materials Ferrite Size Φ20.5*4.5mm
Impedance  300 At around 1KHz
Power Rating Normal 30mW RMS Maximum 50mW
Output Sound Pressure level 83±3dB /100mW /1cm  With Artificial ear per channel
Average at 1.0K, 1.2K, 1.5K, 2.0KHz
Resonance Fo           100Hz
Frequency Range         100Hz~3000Hz
Distortion  5% Maximum at 1KHz /100mW /1cm
Abnormal Sound Test Must be Normal Tested by 3.0Voltage Sine Wave
Load test 30mW RMS  White noise for 48hrs

2  Microphone
Type  Noise Cancelling Dynamic Mic.
Case Material           ABS Plastic
Sensitivity 0°-71dB±3dB (at L=50cm)  (0dB=1V/Pa,1KHz)
Impedance  Low impedance 150  
Frequency  600Hz~12000Hz
Standard operation voltage  1V
Sensitivity reduction      Within -3dB at 1V

3.  Boom Type  Universal Flexible and Hinged Wire
4.  Plug  Microphone&Earphone- 5P Mini Chassis XLR Connector, Male
5.  Jack  3.5mm Phone Jack for iPod, Scanner, or other Device
6.  Colour  HP90 Black/ HP91 Carbon Fiber
7.  Switch Type  Push To Talk Button(P.T.T)

Case Material           ABS Plastic
Water Proof Cover        Silicone Rubber(Black)