Single-Ear Intercom Headset For IS103 Intercom System Closed Dynamic Noise isolation Microphone mute function by flipping up the microphone Colour: Black Technical data of the handset: Frequency response: 20 Hz - 20,000 Hz Impedance: 400 Ohm Sensitivity: 96 dB SPL (1 kHz /1 Vrms) 100 mW input power Technical data of the microphone: Dynamic Polar pattern: Cardioid Frequency response: 50 Hz - 15,000 Hz Impedance: 200 Ohm Sensitivity: -64 dBV/Pa (0.6 mV/Pa) @ 1 kHz 1.5 m long connection cable with 4-pin female XLR plug