Koss QZ/900 Noise Cancellation Headphones

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ABOUT THE PRODUCT
Koss QZ/900 Noise Cancellation Headphones

FEATURES
Active noise cancellation headphones
Frequency response 20Hz - 20kHz
Impedance 32 ohms
Sensitivity 100dB SPL/1mW
4ft (1.2m) cord
1/8" (3.5mm) plug
Up to 50 hours battery life
Detachable cord for wireless noise reduction