Purchased for a single, specific purpose, and usually used with explosive effect. Everything would be great if the earpiece didn't keep slipping off. The serial number is easily accessible, as it is printed inconveniently on the inner cover of the case; this verifies that the item is genuine, but tailored to the Chinese market (not global). Benefits include: These don't quite match the quality of the best ones, but they don't sound terrible either. Beyers DT 990, an old AKG (I can't recall the model), Sony WH-1000-XM4, and, uh, a little of scraggly vintage Sennheiser, roughly equivalent to a CX300. Excellent craftsmanship. They don't make you feel like you're in some savage Chinese cellar. Cheap! Some drawbacks: The right earpiece fell out on the first day of use, and no amount of dancing revived its efficiency in the fields. The only way I was able to get the work back was to charge both of them (with the case plugged into a USB).
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