• Frequency Response - 10-20,000 Hz
• Dynamic element for extended frequency response
• Unique earbud design directs sound into the ear canal for deep bass and extended frequency performance
• Speciality ear cushion material forms slowly in the ear canal to provide a custom fit and maximum isolation
• Includes replacement ear cushions

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A Portable headphone is a headphone that is used on-the-go. Portable headphones tend to be smaller, more lightweight, and may have features that lend themselves to listening on-the-go, like carrying cases or collapsible headbands.PRODUCT FEATURES:Dynamic element for extended frequency response;Unique ear bud design directs sound into the ear canal for deep bass and extended frequency performance;Improved slow memory ear cushions deliver better fit and isolation;Includes replacement ear cushions;Reliable L plug for improved reliability and durability.

Customer Rating:
Summary: Koss Sparkplug Ear Plugs
Comment: This pair of in ear headphones has been the best sounding set I have had to date. Bass response is great, Highs are fair. Overall sound repro is excellent. Noise cancellation is great from the use of memory foam that creates a snug fit in the ear. You can't go wrong by getting a set of these ear buds. The price is also great, less than $10.00 when purchased from Amazon.com

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Customer Rating:
Summary: You get what you pay for!
Comment: Well, at least they only cost 10$ For that amount, I'm not so disappointed that I can't get out of bed in the morning or anything. HOWEVER I wish I had taken the 10$ and put it towards a better quality pair of headphones.

There is ZERO bass thorugh these little buds.

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Customer Rating:
Summary: not good
Comment: the quality is bad, not at all convenient. sound sucks, foam pads are too bad...

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Customer Rating:
Summary: lightweight, good sound, & keep a lot of ambient noise out
Comment: I've used these for quite a few years now, but the one thing that always bothered me was that one plug always went dead after a few months, and I'd have to get a new set. Granted, I used them when working out among other things, so I gave them a beating, but it was still annoying. I then bought a much more expensive brand, based on reviews I read here at Amazon. And I have to say, those others REALLY annoyed me. They're too heavy and didn't fit into my ears as well. And because the wire's heavier, they're more cumbersome. Also the sound was supposed to be so superior, but I found very little in the lower frequencies. So I'm back to these. And I have to say, the ones I've gotten recently don't seem to break as quickly. Maybe I'm being more careful, or maybe they're making them better, but for the 12 bucks or so that I spend, they're definitely worth it.

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Customer Rating:
Summary: A great price until checkout
Comment: Graet headset 2nd time I purchased the "Sparkplug". Nice sound and isolation for the money. To me they sound as good or better than the $30.00 sony phones they replaced. The shipping time was really fast, US mail as I recall. I just wish these companies would all disclose S&H costs before the end of checkout. A padded envelope could have been sent for "3 postage stamps "tops". I understand they need to pay someone for the boxing and so on but I don't like to be baited by the lowest price on the web, only to find high ball S&H charges. Were not stupid were going to see the total!!!! You prices and service are as good or better as anyone elses in the subtotal category This appears to be a good company, they should refrain from those practices

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