Specifications Headphones Type Closed-back Dynamic (Headphone) Cardioid Dynamic (Microphone) Driver Diameter 40 mm (Headphone) Frequency Response 20-20,000 Hz (Headphone) 40-20,000 Hz (Microphone) Maximum Input Power 1,600 mW at 1 kHz Sensitivity 100 dB (Headphone) -57 dB (1.4 mV) re 1V at 1 Pa (Microphone)