Hm-803 Headphone with Microphone & Volume Control MidiLand HM803 Dynamic Stereo Headphones General Features: Black color Dynamic stereo headphones Adjustable microphone arm Volume control for sound level adjustment Compatbile with all sound cards Adjustable headband Foam ear cushions Headphone Specifications: Frequency Response: 20 Hz - 20 KHz Impedance: 32 Ohms Sensitivity @ 1 KHz: 91 dB Maximum power input: 100 mW