• 330 degrees rotatable boom arm
• 180 degrees rotatable joint of speaker and headband
• ergonomically designed frame, soft ear cushions, lightweight headband and flexible cord
• multi-device connectivity for desk phone, IP phone and PC (RJ9 plug, 2.5mm/3.5mm stereo plug, USB2.0 plug)
• noise-cancelling microphone to filter out background noise
• anti-static technology for hearing health
• optional accessories (M-Volume Controller, Quick Disconnect, G-QD or P-QD)
• FCC, CE, ISO, RoHS certificated
• 2-year warranty

Microphone:
Directivity: noise-cancelling
Size:φ6.0* 2.7mm
Frequency Response:100HZ ~ 3.4kHZ
Sensitivity:-40±3dB (0dB=1V/Pa,1KHz)
Impedance:2.2k ohm
Voltage:3.0 V
Electricity:150uA ~ 450uA
Voltage range:1.1 ~ 10.0V
Degree of distortion:less than 3%

Earphone:
Diameter :φ27mm 
Frequency Response:150HZ-6.8KHZ
Sensitivity :108±3dB(at 1KHz 1mw)
Impedance:150 Ω±20%
Degree of distortion:less than 3%
Rated input power:30mW 
Max input power:50mW