Sennheiser's CX 400BT True Wireless is the audio specialist's latest premium (True Wireless) Bluetooth earbuds. They deliver exceptional sound quality, optimal comfort and customizable touch controls as well as providing the best possible listening experience thanks to their ergonomic design and all-day battery life. Designed by our audio experts, Sennheiser's 7mm dynamic drivers ensure that the earbuds deliver outstanding stereo sound that places them in a league of their own. As well as their audiophile driver technology, this sound performance is assured by an internal audio EQ, and by the latest Bluetooth 5.1 technology, AAC and aptX compatibility. Superior sound. Tailored to you. Your day-to-day may change but your enjoyment of superior sound won't. Powered by Sennheiser's leading audio technology, the new CX 400BT True Wireless gives you total control over an exceptional sound experience. With intuitive customizable controls, long-lasting battery life and a design made for all-day comfort, they are the ideal, uncompromised choice for people that are passionate about great sound. 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 personalize your listening experience with built-in equalizers 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 our wide range of audio codec support including SBC, AAC and aptX, premium sound is guaranteed with any mobile device.