HM Series headset microphone is ideally suited for vocal sound and speech  application which  requires much freedom of movement.  
      Especially the smaller 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. 
      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 

HM-52S-1/2/3/4 
Element……………………...Back Electret Condenser 
Polar Pattern………………Omni/Omni/Uni/Uni-directional 
Frequency Response……20Hz- 20KHz/20Hz- 20KHz/50Hz-16KHz/50Hz- 16KHz   
Sensitivity…………………....-42dB/-46dB/-53dB/-45dB± 3dB 
Output Impedance……….2200Ω± 30% 
Max.Input SPL……………..130dB 
S/N Ratio…………………...…>70dB 
Power Supply………………1.5V-10V 
Cable……………………….....Φ1.5*1.2M 
Dimension……………………Φ3.5mm/Φ5mm/Φ5mm/Φ7mm 
Color………………………….....Black, Skin or other 
Accessories………………….Windscreen