Koss QZ-77 Active Noise Reduction Ear Plug System

The QZ77 Stereophone features both Active Noise Reduction (ANR) & Passive Noise Reduction (PNR) technology which eliminate harmful & unwanted noise while still providing the ultimate in stereo sound. For years we have been striving to improve on the sound

• Reduces harmful and annoying low frequency sounds in noisy environments
• Specialty ear cushion material forms slowly in ear canal providing a custom fit and maximum isolation
• Dynamic stereo phone element for extended frequency response (10 - 20,000Hz)
• Reduces harmful and annoying low frequency sounds in noisy environments
• Specialty ear cushion material forms slowly in ear canal providing a custom fit and maximum isolation
• Dynamic stereophone element for extended frequency response (10 - 20,000Hz)
• Compact design for convenient travel and portability
• Ideal for in-flight use