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The Koss HP1 headphones were built for use with personal stereo systems such as portable CD and MP3 players. Foam ear cushions give open, hear-through sound so you won't be isolated from the world while listening to your music. The Koss HP1 headphones have a 0.125-inch plug, compatible with nearly all portable audio products. They have a frequency response of 100 to 16,000 Hz, sensitivity of 86 dB per milliwatt, and less than 1.5 percent distortion. They are a light 0.7 ounces with a straight, dual entry 4-foot cord.