Product Features: Over-ear headphones Battery life: up to 20 hours Works with Amazon Alexa / Google Assistant iOS / Android compatible Microphone / volume control Built-in Google Assistant and Amazon Alexa: Control your headphones with your voice thanks to Google Assistant built-in to the Bose QuietComfort QC35 II Wireless Bluetooth Noise-Cancelling Headphones. Press and hold the action button and let your assistant know what you want to do - play music, adjust the volume, you can even receive texts and ask questions. You can also control the headphones using Amazon Alexa via a software update, making it even easier to stay in control of your music at all times. Bluetooth headphones: Bose QuietComfort QC35 II deliver a high quality audio experience directly from your smartphone or tablet, completely wirelessly using Bluetooth or NFC. Bose's impeccable sound always ensures you hear audio at its best, and with a volume optimised equaliser whatever you're listening to sounds great whether it's quiet or loud. Download the free Bose Connect app to your smartphone for extra control and features - manage connections, share your music and more. Active noise-cancellation: Immerse yourself in music with the Bose QuietComfort Headphones. They have active noise cancellation, and it's adjustable so you can set it to suit your listening environment. Block out everything on a busy train and relax into your daily commute, or switch it off to stay alert. Built-in battery: With a built-in battery that lasts up to 20 hours per charge, your headphones will easily last throughout the day - and into the night. If they do happen to run out of power, you can still listen with the included cable - just connect to your device and they're instantly ready to use. High quality design: Built to last and built to feel great, the Bose QuietComfort Noise-Cancelling Headphones are the perfect mix of functionality and comfort. Tough materials such as stainless steel and glass-filled nylon add strength, while luxurious Alcantara on the earcups is a joy to wear. Specifications: Type: Over-ear headphones Colour: Black Jack: 3.5 mm jack Bluetooth: Bluetooth 4.1 Bluetooth / wireless range: 10 m Foldable: Yes Type of earcup: 360-degree rotatable earcups Earpad / ear tip material: Leather Acoustic system Closed Single-sided cable: No Detachable cable: Yes Cable length: 1.2 m Passive noise-isolating: Yes Active noise-cancelling: Yes Controllable noise-cancelling: Yes Compatible voice assistant: - Google Assistant, Amazon Alexa.