|      HE 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   HE-30S-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...............2200 30% Max.Input SPL......................130dB S/N Ratio...............................>70dB Power Supply.......................1.5V-10V Cable...................................1.5*1.2M Dimension............................3.5mm/5mm/5mm/7mm Color....................................Black, Skin or other Accessories..........................Windscreen |