Type: - Dynamic Noise Cancelling * Frequency Response - 100 to 5,000 Hz * Output Level - -58dB (0dB = 1 mw/10 microbars), -76dB (0dB = 1 volt/microbar) * Impedance - 200 ohms, matches any radio * Cable - Six wire, five conductors, one conductor shielded, metal cord, with durable strain relief