Best Mobile Headphones - Sennheiser MM 400-X Bluetooth Review
It's pretty easy to only buy one pair of headphones ever, or slip into filling ever more niche use cases as you balance the best sound and portability for your needs. Bluetooth has long promised to cut the cables, but until now, the compromise has been too great. Sennheiser shows how it's done with the MM 400-X mobile headphone.
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