WI-C400 | Help Guide | Controlling the audio device (BLUETOOTH connection)
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User manual Sony WI-C400 (English - 95 pages)
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Sony WI-C400 Wireless Review - RTINGS.com
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WI-C400 | Help Guide | Sound skips frequently during playback.
Sony WI-C400 Wireless Review - RTINGS.com
WI-C400 | Help Guide | Charging the headset
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How to Pair Sony WI C400, Bluetooth Pairing Problem with Sony headphone - YouTube
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WI-C400 Wireless In-ear Headphones | WI-C400 | Sony Liberia
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