The Koss BT540i Wireless Headphones are a high-end solution for audio lovers who desire the combination of uncompromising sound quality, maximum comfort and wireless connectivity. The BT540i have it all with a dual mic for your hands-free calls on top. These ergonomically designed headphones come with earcup cushions made of premium leather and memory foam. They will envelop your ears, immersing you in the astonishing sound clarity of the Koss drivers. The precision-tuned PLX40 Dynamic Elements deliver crisp highs, robust mids and smooth lows. Connect these headphones to your favourite audio device using Bluetooth with aptX codec technology or NFC. You can also use the attached audio cable to use a 3.5 mm jack connection instead. Use these headphones with your smartphone – both of the earcups have a built-in microphone for your calls. The intuitive controls placed on the sides of the earcup allow you to answer the phone without touching it, and you can also adjust the volume or change tracks. The integrated battery delivers more than 12 hours of listening experience. And when you need a recharge, use the attached micro USB cable.