The condenser microphone needs external power supply to work normally. It is usually equipped with: 48V phantom power external sound card USB small sound card etc. and configure different devices according to personal usage habits. Feature C Frequency Response: 20Hz-20kHz C Sensitivity: -34 2dB(0dB=1V/Pa at 1KHz) C Output Impedance: 150 30%(at 1kHz) C Load impedance: 1000 C Equivalent Noise level: 16dBA C Electrical current: 3mA C Cable Length: approx 2.5M C Voltage: 48V Phantom power C Microphone Material: Steel net + Zinc alloy hand holding part