Get the signature B&O sound and the power of next generation noise cancelling in your pocket. Bask in glorious quality audio, shut out the noisy distractions of the outside world, or tune back into your surroundings easily with transparency mode. Crafted from premium materials for comfort and enhanced noise isolation, and with a long-lasting battery, the Beoplay E4s keep you fully immersed in beautifully rendered music. Signature B&O Sound With the renowned sound of Bang & Olufsen, your music is crisp, warm and dynamic. Read more… Each earphone's speaker houses a 10. 8mm electro-dynamic driver, delivering a wide frequency range of 10-16000 Hz for deep bass and delicate trebles. Active Noise Cancellation Next generation hybrid Active Noise Cancellation (ANC) allows you to shut out the world around you and get fully immersed in your music. Tune out background noise, talk on the phone without distraction, or just enjoy a well-deserved bit of peace. And Transparency Mode lets you tune back into your surroundings with one quick gesture. Long Battery Life A rechargeable battery keeps you in ANC-boosted music for up to 20 hours. So they'll keep going all day. And all evening! Should the battery eventually run out of power, it's only the noise cancelling that stops, so you can keep listening to your tunes, just mixed with the sound of your surroundings. In-line Mic/Remote Control the music and take calls with ease with the in-line microphone and remote, which is optimised for iOS devices. Premium Materials Crafted from lightweight metal the E4s are elegant, durable and scratch-resistant, while the in-line remote and ANC control unit have a sleek aluminium and rubber finish for easy tactility. They come with a wide choice of ear-tips so you can find the perfect fit. Comply memory foam ensures a secure, comfortable feel, with materials that boost noise isolation, and four sizes of silicone tips offer the full size range to suit every ear.