Initially designed for racing radio scanner and metal detector users, the Koss QZ99 Passive Noise Reduction Headphones feature superior isolating capabilities and secure over-the-head headband design. 

The closed Pneumalite™ ear cushions and extra-secure headband create a tight seal around the ear eliminating all ambient noise and are built to withstand the rigors of indoor and outdoor use. 

Key Feaatures

• Dynamic element delivers accurate acoustic sound reproduction with a wide frequency response

• Oxygen-free copper voice coils improve signal transmission and conduction for cleaner, clearer sound
  

• Closed, leatherette ear cushions form comfortable seal around ears, enhancing bass frequencies and decreasing ambient noise

• Adjustable headband adapts to any head size and shape for added comfort.
  

• 40-20,000 Hz
• 60 Ohms
• 102dB SPL/1mW
• Coiled, Single Entry 8ft/2.4m