Now you can enjoy the CX True Wireless 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 Sennheisers 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 IPX4 splash resistance and great passive noise cancellation provided by the secure fitting ergonomic design. Bespoke 7mm dynamic driver Powered by Sennheisers audio expertise. Personalized with the built-in equalizer and Bass Boost. Passive Noise Cancellation The ergonomic in ear design is made for all-day wearing while the selection of 4 ear adapter sizes (XS/S/M/L) creates a secure fit for excellent passive noise cancelling. Bass Boost Special EQ pre-set can be activated via the Smart Control App for more intense bass IPX4 Splash resistance for trouble-free use while travelling, commuting or exercising Battery Life Up to 9 hours play back time with up to 18 hours available with on the go charging via the case, for a total of 27 hours Personalized controls Independent use ear buds with customizable touch-sensitive technology lets you manage your music, make calls or trigger the voice assistant on your terms. What’s in the Box CX True Wireless Earbuds Charging case USB-C charging cable Silicone ear adapter sets (XS/S/M/L)