Yaesu Original MD-100A8X Dynamic Desk-Top Microphone w/ Active Filtering for Tone Control Frequency Reponse: 100 to 5,000Hz Polar Pattern: cardioid Sensitivity: -75 dB (0 dB=1 V/0.1 Pascal) Impedance: 500 ohms unbalanced - Net Weight: 670 grams (without cable) Compatible: FT-450, FT-450D, FT-840, FT-847, FT-857/D, FT-890, FT-897/D, FT-950, FT-990, FT-1000, FT-1000MPV and FT2000