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These earphones do not look like much, but don't be fooled by that, they are two very powerful and well engineered pieces of technology. As with all speakers, I tested them over five tracks of varying audio: classical, spoken word, pop, metal and electronic- these provide a good range of pitch types and dynamic changes. These headphones proved very useful for the classical piece, with a surprisingly strong bass sound and they provided good depth and was generally very smooth. The spoken word proved reasonably clear, but a little quite (compared to most headphones). The other tracks scored above average in sound quality terms Sennheiser manufactured these headphones for exceptional durability, and they are very durable. It is fully waterproof and shock proof- making it perfect for the athlete and jogger market. They come with a 'sports clip' so you can attach it to your shirt to avoid having the phones fall out while you run. The cable is 1.2 metres long- more than enough, they run on a 3.5mm jack- to work on any MP3 player (including iPods) and retail at £17 (on Amazon) Overall, these headphone provide great quality sound (especially in the bass department) and brilliant durability at a very good price.