Great news for music lovers who lead the mobile life. Here comes a headset that brings on all you need and want to enjoy your music on the go: The wireless freedom of movement, the intuitive ease-of-use, the portability, the effortless style. But most of all: The sound, powered by proprietary Sennheiser drivers.The new Sennheiser HD 4.40 BT offers high-quality wireless sound for every day listening on the move. The closed-back, around-ear headset features Bluetooth 4.0 and aptX compatibility to deliver true Hi-Fi sound with a satisfyingly dynamic bass. Its elegantly minimalistic design has been crafted from robust, high-quality materials to meet the requirements of the street.You can take it with you. Versatile and vibrant, the new HD 4 series offers you the complete Sennheiser quality package in a range of durable, closed-back over-ear headsets that fulfill your everyday aural needs.When you love the sound of the HD 4.40 BT, that’s no coincidence at all. The closed-backed design of this headset is fitted with proprietary Sennheiser drivers that came a long way before being allowed to transmit sound to your ears. So, enjoy their well-balanced, amazingly detailed sound with dynamic bass.Want to take or make a call, change a track, adjust the volume? With the intuitive ear-cup mounted controls and the integrated microphones of the HD 4.40 BT all this is actually fun. Have a try.The HD 4.40 BT was made to go places with you – and make these places more pleasurable. With its around-ear design and deep, ergonomically designed ear pads it offers comfort even during extended listening sessions. Its robust foldable headband design that can be easily and compactly stored in the supplied protective case makes for perfect portability.Elegantly minimalistic – using tough, high-quality materials: That is how the HD 4.40 BT was designed. Its sleek frame not only makes it more comfortable to wear, it also makes a statement of timeless class.