product manual: Sony SN-703 Karaoke Wired Microphone Microphone K song microphone characteristic: 1. Heart-shaped pointing to the way of pickup, to minimize feedback 2. The sound quality is clear, the treble has no blasting sound 3.Strong structure, sophisticated materials 4. Built-in high-efficiency filter sponge with wind noise and popping 5. Stable and reliable performance Technical Parameters: Monomer: moving coil Directivity: single point Frequency effect: 100Hz-13KHz Sensitivity: -63dB ± 3dB (0dB = 1V / Pa at 1KHz) Output impedance: 600Ω±30% (at 1khz) Configuration: 5 meter long microphone cable