Freeboss Hs-52s2-l5a Skin Color 5mm Mini Mic 3 Pin Mini Xlr Headset Microphone for Body-pack Transmitter Only for AKG type!!!Only for AKG type!!!Only for AKG type!!! Designed for use on stage, Houses of Worship, Presenters, Lecturers and Other Applications Requiring Minimum Microphone Visibility with hand-free Operation Smallest 5mm super-micro omnidirectional Back Electret Condenser cartridge, 3 pin mini XLR plug, 1.2M cable. Frequency response: 20Hz-20KHz Sensitivity: -453dB Output Impedance: 2K ohm  30% (at 1KHz) Max. Input SPL: 135dB