Fully immerse yourself in luxurious audio ... minus distractions. Harman Kardon FLY ANC headphones' advanced active noise-cancelling technology completely connects you with your music. Precision engineered, these beautifully crafted over-ear headphones deliver up to 20 hours of disturbance-free listening, or up to 30 hours with noise-cancelling switched off. Minimise the impact of interruptions by switching seamlessly between separate devices with multi-point connection. Stay on top of it all with Google Assistant and Amazon Alexa built-in and for the ultimate in luxurious audio, completely customize your sound experience through Harman Kardon Headphones' App.===// GOOD TO KNOW:  Playback time with BT on and ANC on | Up to 20hrs Playback time with BT on and ANC | Up to 30hrs oous