The Sennheiser CX 400BT True Wireless Earbuds Provide Complete Control Over Your Sound Experience - IMBOLDN
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Sennheiser CX 400BT True Wireless review: Good sound at a better price | Android Central
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Sennheiser Consumer Audio CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, White : Everything Else - Amazon.com
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 CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, White : Everything Else