By Andrew Williams
15 Mar 2012
Used Good Condition Sennheiser MM 550-X Travel Headphones Y127
Sennheiser MM 550 Wireless Bluetooth Noise Cancelling Travel Headphones
SENNHEISER MM 550-X Travel Flagship Wireless Bluetooth Headphones MM550X
It's time you heard how amazing digital audio can really sound
The best cheap, in-ear, on-ear, over-ear and hi-fi headphones
Updated: We put the top of the range running headphones to the test.
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