Sennheiser's HD4. 30i closed-back over-ear headphones offer superb audio quality combined with a durable and compact folding design. Plush leatherette ear-pads ensure a comfortable listen, and an inline remote and microphone allows you to stay in control of your music and calls on the go. Superb Sennheiser Sound The closed-back over-ear design creates an exceptional soundscape with precise acoustic response and rich, dynamic bass. Powered by a 32mm driver, and with a frequency response of 18-22000 Hz, audio is detailed, balanced, and lifelike, delivering renowned Sennheiser sound quality. Read more… Full Features The tangle-free cable incorporates a 3 button inline smart remote, optimized for iOS devices, giving you full control over your music and calls. Premium leatherette ear-pads keep out much of the noise around you and ensure a comfortable listen, even over long sessions. Versatile and vibrant, the HD4. 30i headphones are lightweight, sturdily designed for everyday use, and, for convenient storage, they can be folded and stored in the pouch provided.