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Whether you’re in the mood for calming tunes or crave some thrilling beats, the bespoke drivers of the Sennheiser CX 400BT True Wireless earbuds deliver high-fidelity sound with deep bass, natural mids and a clear, detailed treble. Plus, you can personalize your listening experience with built-in equalizers to enjoy amazing sound quality that’s tailored to you. Earbud Features Immerse yourself in amazing sound quality thanks to Sennheiser’s unique 7mm dynamic audio drivers and personalize your audio experience with the built-in equalizer and the Sennheiser Smart Control app Manage your music, make calls or trigger the voice assistant with customizable touch-sensitive technology built into both earbuds Enjoy outstanding sound quality no matter your mobile device with our wide range of audio codec support including AAC, aptX and SBC Experience non-stop play time with a 20 hours of battery life - 7 hours on a single charge and a further 13 hours via the charging case Experience non-stop play time with a 20 hours of battery life - 7 hours on a single charge and a further 13 hours via the charging case Anytime. All the time. Never miss a beat throughout the day with 20 hours of battery life – 7 hours on a single charge and a further 13 hours with the small, sleek and compact charging case. The new CX 400BT True Wireless earbuds are designed to ensure you get premium sound wherever you go. Premium sound. Any device. No matter where you stand – iOS or Android – you’ll always get to enjoy the outstanding sound quality of the CX 400BT True Wireless earbuds. Thanks to our wide range of audio codec support including SBC, AAC and aptX, premium sound is guaranteed with any mobile device.