HE Series headset microphone is ideally suited for vocal sound and speech      
application which  requires much freedom of movement.       
      Especially the smallest size (the smallest capsule diameter of just 3.0mm)and lightest weight are ideal for application requiring minimum  visibility. Such as     
 dance and sports instructors;Great for video use , this mini microphone is      
practically invisible.      

Direct connection Type(A  series)         1/2/4  
L1   Standard 2.5mm single  plug         
L2   Standard 3.5mm stereo plug     
L3   Special thread  type 3.5mm plug     
L4   Sennheiser type 3.5mm stereo plug     
L5   AKG type 3-pin mini XLR     
L6   Shure type 4-pin XLR     
L7   Audio-technica  type 4-pin  mini XLR     
L8   Special usb plug      

Element……………………………………Back Electret Condenser      
Polar Pattern……………………………Omni-directional /Uni-directional/Omni-directional     
Frequency Response………………20Hz- 20KHz /20Hz- 20KHz /50Hz-16KHz   
Sensitivity………………………………-44dB± 3dB /-44dB± 3dB /-46dB± 3dB    
Output Impedance…………………2200Ω± 30%      
Max.Input SPL…………………………130dB      
Power Supply…………………………1.5V-10V      
Cable………………………………………Φ1.5*1.2M      
Dimension………………………………Φ3.5mm/Φ5mm /Φ7mm     
Color………………………………………Black, Skin or other      
Accessories……………………………Windscreen