Top features: – Noise-cancelling with active and passive reduction – Lightweight, durable and comfortable design – Variable ear tips for versatile listening – Up to 19 hours playback with the rechargeable battery Noise-cancellingEnter a world of crystal-clear music Bang & Olufsen Signature Sound with the E4 Noise-Cancelling Headphones. Adapt your level of noise-cancellation so you can hear as much, or as little of your surroundings as you want. If you’re travelling on a busy train, go for total cancellation and immerse yourself in your music. If you’re out for a run, turn the levels down so you can still be aware of what’s going on around you.Lightweight, durableThe E4 Noise-Cancelling Headphones are created from lightweight metal for a stylish design that’s tough and scratch-resistant. The inline remote control and ANC control unit come with a stylish aluminium and rubber finish for increased tactility and durability.Variable ear tipsOpt for the Comply memory foam ear tips to enhance the noise cancelling effect with a firm, comfortable fit and noise isolating materials. If you prefer silicone tips you can simply slip them on and enjoy the earphones however you like them.Up to 19 hours playbackThe rechargeable battery inside the noise cancellation control unit gives you up to 20 hours of continuous playtime when turned on. If you do happen to run out of battery you can still enjoy your music, just without noise cancelling features.