Dynamic 7mm TrueResponse Drivers, Active Noise Cancellation, Up to 8 Hours of Playback, Charging Case for 16 Additional Hours, Let Audio In with Transparent Hearing, 2 x Noise-Reducing Mics in Each Earbud, Beamforming Microphone Technology, IPX4 Water & Sweat Resistance, Auto Pause/Play when Removed/Inserted, Full Functionality with 1 Earbud or 2 Take control of your audio experience with the customizable CX Plus Noise-Canceling True Wireless In-Ear Headphones from Sennheiser. Using dynamic 7mm TrueResponse drivers the CX Plus earbuds are made to deliver rich audio and deep bass which can be fine-tuned with a built-in equalizer by using the Sennheiser Smart Control app. When listening in public use active noise cancellation to isolate yourself from distracting ambient noise but if you need to let the world back in simply activate Transparent Hearing via the integrated touch controls. These touch controls let you adjust music hands-free calls and voice activation of your digital assistant.