MadBoxPC posted a review on the Zalman ZM-DS4F Headphones in Spanish
A quote from the article:
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Zalman's ZM-DS4F headphones are foldable and lightweight, featuring a 40mm woofer and 28mm tweeter per channel, this stereo speakers have a suggested price of $29.95 USD. Sounds great with any MP3/MP4 player, but can also used for PC Gaming
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Read more (with translator)