Perfect for on-the-go. Versatile and captivating, the new HD 4 series offers the complete Sennheiser quality package in a range of robust, acoustically closed over-ear headsets that enhance your day with exceptional sound. If you are thrilled by the sound of the HD 4.40 Wireless, it's no coincidence. The acoustically closed design of this headset is equipped with Sennheiser drivers that underwent a long development process before they were allowed to deliver music to your ears. Enjoy the balanced, incredibly detailed sound with deep, dynamic bass. The HD 4.40 Wireless is all about freedom of movement. That's why there are no cables. Instead, you get the latest wireless technology with Bluetooth 4.0 and aptX codec, ensuring reliable transmission and true Hi-Fi sound. Near-field communication allows for quick and easy pairing with compatible mobile devices. Making phone calls, switching music tracks, adjusting volume – it’s all a lot of fun with the intuitive controls integrated into the ear cup of the HD 4.40 Wireless. Give it a try. The HD 4.40 Wireless is designed to accompany you everywhere, making you feel more comfortable wherever you are. The over-ear design with deep, ergonomically shaped ear cushions offers unparalleled comfort, even during extended listening sessions. With its sturdy foldable headband, it can be quickly and compactly stored in the included protective carrying case. Elegantly minimalist – designed with durable, high-quality materials: this is how the HD 4.40 Wireless was created. Its sleek, attractive shape not only ensures high wearing comfort but also makes a statement for timeless class.