Sescom LN2MIC-ZMH4-MON 3.5mm Line to Mic 25dB Attenuation Cable for Zoom H4N with Headphone Monitoring Jack Audio Input Level: -10dBV (0.25pp - 0.47pp) Prosumer Line Level Input Impedance: 1.5K ohms Audio Output Level: Approx. 14mV Output Impedance: 92 ohms