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Jaybird X4 review: Great earbuds without much new to offer
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User manual JayBird X4 (English - 25 pages)
Jaybird X4 Review - Is this Wireless Headphones worth a look?
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Review: Jaybird X4 Wireless Sport Headphones
Review: Jaybird X4 Wireless Sport Headphones
Jaybird X4 Wireless Review - RTINGS.com
