KOSS SW 5

Single-sided, mono headphone with dynamic microphone for hands free communication from your personal computer
Dynamic element for extended frequency response
Dynamic microphone for optimized pick up pattern.
Requires no external power supply or battery power.
Frequency Response: 60-20,000 Hz
Microphone Impedance: 600 ohms
Foam ear cushion for open, hear-through sound
Adjustable headband for best fit
Straight, single entry 8 foot cord

Frequency Response 60-20,000 Hz
Cord Straight, Single Entry, 8ft
Plug 3.5 mm
Impedance 32 ohms
Weight 1.5 oz.
Sensitivity 91 dB SPL/1mW
Distortion <1.0
Ear cushions open