Features:

• Frequency range: 20Hz - 21kHz
• Balanced BASSWIND system for powerful stereo sound
• Ideal for portable players such as iPod, MP3 or CD
• Lightweight (21g) and flexible for rugged portability
• Powerful stereo sound due to "2+4 rich bass" tubes

Editor Reviews:

Product Description:
Lightweight and flexible, the PX 10 mini headphones are ideal for portable players. An in-ear system ensures a perfect fit for outdoor use, especially sports activities.

Rating : - Great sound but not great for workouts though
I love the seinnheiser brand and quality so i disregarded the reviews about the headphones not staying on your head during workouts. however, i use them for running and working out and its true, they pop out of your ears all the time when exercising. Also, noone has mentioned that there is a volume control on the wires. This would be great if it worked. I constantly have to make sure that it doesnt get wet and find myself adjusting it all the time to get sound out of the headphones. Now its so shaky its not even worth wearing. Great sound but i would get another pair