The Sony Noise Cancelling Headphones give truly wireless freedom with Bluetooth streaming, Smart Listening by Smart Auto-settings and charging on-the-go. No wires, just industry-leading noise cancellation tailored to your environment in a minimalist design. Digital Noise Cancelling 6mm driver Uninterrupted Bluetooth streaming Smart Listening by Adaptive Sound Control 9 hours of battery life Small but perfectly clear Wear discreetly and comfortably in your ears all day long. A tiny 6mm driver sits inside the headphones to deliver clear sound and an ergonomic ear hook keeps your headphones in place and the internal antenna and fitting supporter keep the signal strong for constant streaming. Smart Listening Smart Listening by Adaptive Sound Control automatically detects your activities such as travelling, walking and waiting then adjusts ambient sound settings to you. You can customise them to your preferences with the Sony I Headphones Connect APP. SENSE ENGINE gives you the power to tune in and out of your music at a touch. Switch on normal mode to hear all essential background sounds. Switch on voice mode to make sure you never miss announcements. Charge as you go Stay powered up wherever you are. No need to worry about battery life, just place your headphones in the carry case to charge on the go and the auto on/off automatically turns on and off to save battery when not in use. Enjoy up to 9 hours of battery life (with charging case), 3 hours of music playback on 1 charge (15 min charge for 70 min of listening).