Freeboss Hs-52s2-l6a Skin Color 5mm Mini Mic 4 Pin Mini Xlr Headset Microphone for Shure Body-pack Transmitter Suit for wireless body-pack (for Shure 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, 4 pin mini XLR plug, 1.2M cable. Frequency response: 20Hz-20KHz Sensitivity: -453dB Output Impedance: 2K ohm  30% (at 1KHz) Max. Input SPL: 135dB