Digital noise cancelling: Industry leading Active Noise Cancellation (ANC) lends a personalized, virtually soundproof experience at any situation Voice assistant: Alexa, Google Assistant & Siri enabled (In-built) for voice access to music, information and more. Activate with a simple touch Speak-to-chat: Headphones use an array of smart technologies to create a seamless, hands-free listening experience. For eg, simply start speaking to automatically pause your music in Speak-to-Chat Wearing Detection: Proximity sensor and two acceleration sensors in your headphones can detect whether you are wearing them or not, then adapt playback accordingly to help save battery power Quick attention mode: Cover the right ear cup with your palm to turn down music for instant, easy conversation Smart listening: WH-1000XM4 adjusts the ambient sound to your activity to give you the best noise cancellation Long battery life: A single charge provides up to 30 hrs of playtime for reliable all day listening Quick charging: Quick charge for 10min charge for 5 hours play back Touch controls: Change the track, turn the volume up or down and take or make calls by tapping or swiping the panel with your fingertip Operating Instruction, Instruction Manual, USB Cable, Carrying Case, In-Flight Adaptor