The Sennheiser CX True Wireless lets you enjoy superior crystal-clear sound, great battery life and effortless ease of use for an outstanding everyday audio experience. German-made 7 mm dynamic drivers create Sennheiser’s signature sound quality. With 9 hours’ play back time and a further 18 hours battery life via on the go charging, you can enjoy this superior experience all day – and in any environment thanks to the great passive noise cancellation provided by the secure fitting ergonomic design.