0ur opinion: :The new Sennheiser Sport Line is the partner for sports. Even when you're going flat out, the headphones guarantee a secure fit and superb wearing comfort. All materials used are extremely robust, long-lived and also sweatand water-resistant. ln keeping with Sennheiser's reputation powerful neodymium magnets ensure a brilliant and detailed sound.PR0DUCT FEATURES:Adjustable stereo clip-on earphones for a secure fit;Ergonomic design ensures optimum fit and comfort;Powerful neodymium magnets for detailed sound;Sweat- and water-resistant;Extremely rugged earphones and cable.
:Designed to keep you grooving during athletic activity, Sennheiser's 0MX70 Sport Line Stereo Clip-on Earphones give you exceptional sound when you're working out. Featuring a patented ultra-lightweight, flexible construction and packaged with a cable clip and an ear adapter set that includes extra ear pads in small, medium, and large sizes, the 0MX70 offers a perfect fit for optimum comfort and stability while avoiding interference with your movements. ln addition, the 0MX70 has individually adjustable ear clips to provide extra comfort and stability for your listening pleasure. And with powerful neodymium magnets in the earphone speakers, the 0MX70 gives you incredible detailed sound reproduction.
Design Like all the earphones in Sennheiser's Sport Line collection, the 0MX70 is designed for rugged indoor and outdoor activity. Whether you're in the dance studio, on the running trail, or in the weight room, you can stay focused through your entire workout with your favorite music. The 0MX70 is also sweat and water resistant, so you can extend the life of your earphones by washing them. And when you're not listening to your portable device, coil up your earphones and store them in the protective carrying case included with purchase so that they don't get tangled up with your keys, cell phone, or other accessories.
lntended Use 0f course, you can also listen to tunes while you're running errands or just relaxing. The 0MX70 is great for use with all MP3, CD, DVD, and MD players, as well as with all portable game systems. So now you can get great sound and stay connected and entertained no matter what you're doing.
So go ahead, break a sweat. With your own set of Sennheiser 0MX70 Sport Line earphones.
What's in the Box 0MX70 earbuds, ear adapter set, cable clip, and carry case.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Good sound, great afterservice but has failed twice ...
Sennheiser product quality is well known and respected. Therefore, I cannot understand why within eight months of use (workouts on bicycle, Ellipticals, Treadmills)I continue to have failure problems. First one side goes out and then the other. I think there is a problem with the copper wire connections. Has anyone else had this problem? I do have to say that the Service Center does quickly replace the product if under the two year warranty
Buyer's feedback: 
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CRAP CRAP CRAP
After reading a number of reviews some from other sites I believed these were a nice set up. Well not true, not only do they NOT fit in your ears but try working out and lying down, they fall out of your ears completely. For the cost the cheapies that came with my mp3 player are far superior to these.
Buyer's feedback: 
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* A+, I was satisfied 100% ...
I got the product right on time and the product is in perfect shape, if i ever need to buy something else, i will look here first.
Buyer's feedback: 
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EXCELLENT WORKOUT HEADPHONE
This is an excellent headphone for working out. On average, I jog 6 miles 5 days a week and so far, this headphone had worked just fine. The quality of sound you get out of it is not the greatest, but it will do for now.
Buyer's feedback: 
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* not for small ears ...
I have smallish ears and ear canals and can't use these things. I'd had a set of MX-75 for 1.5 years which were a decent fit , good sound quality and good for workouts as sweat didn't seal them as all other buds I'd tried did. The 75's were retired when the wires had broken right outside the plug, the self-tangling cords were an irritant, too much twist, too sticky! but they had survived ~500 uses. So I'd assumed that these would have the same size transducer cage and roughly the same fit , but apparently not. the OMX-70s have a larger metal cage and won't go into my ear properly even with the ear clip's rotation, extension and springiness . Phooey!