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Sennheiser CX 400BT True Wireless review: New premium earbuds sound great but are a bit chunky - CNET
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Amazon.com: Sennheiser Consumer Audio Sennheiser CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, Black : Everything Else
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Sennheiser CX True Wireless vs Sennheiser CX 400BT: what's new with the wireless earbuds? | TechRadar
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