With passive noise cancellation, intuitive customisable controls, long-lasting battery life and a design made for all-day comfort, the Sennheiser CX 400BT True Wireless Earphones are the ideal, uncompromised choice for people that are passionate about great sound. 7mm dynamic driver Passive noise cancellation Built-in Bluetooth connectivity Built-in equaliser Customisable touch controls 20 hours battery life Better sound, better control Whether you’re in the mood for calming tunes or crave some thrilling beats, the bespoke drivers of the new CX 400BT True Wireless deliver high-fidelity sound with deep bass, natural mids and a clear, detailed treble. Plus, you can personalise your listening experience with built-in equalisers to enjoy amazing sound quality that’s tailored to you. Premium sound, any device No matter where you stand – iOS or Android – you’ll always get to enjoy the outstanding sound quality of the new CX 400BT True Wireless earbuds. Thanks to Sennheiser wide range of audio codec support including SBC, AAC and aptX, premium sound is guaranteed with any mobile device. Stylish comfort The new CX 400BT True Wireless is made for those who enjoy diving into a long playlist, a lively audiobook or a loving phone call. They have an ergonomic design created for all-day comfortable wearing. The earbuds achieve a perfect fit in the ear for excellent passive noise cancellation and keep the earbuds securely in place, thanks to adapters provided in a choice of 4 sizes. 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.