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User manual JayBird X4 (English - 25 pages)
Jaybird X4 review: Jaybird's new X4 wireless sports headphones offer a more comfortable fit - CNET
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Amazon.com: Jaybird X4 Wireless Bluetooth Headphones for Sport, Fitness and Running - Storm Metallic (Renewed) : Electronics
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Jaybird X4 Black Metallic/Flash Bluetooth Wireless Sweat-Waterproof Headphones 97855143204 | eBay
Jaybird X4 985-000809 In Ear Wireless Headphones | eBay
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Review: Jaybird X4 Wireless Sport Headphones
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Jaybird X4 - Earphones with mic - in-ear - Bluetooth - wireless - flash, black metallic - Walmart.com