The new Sennheiser MOMENTUM Wireless lets you experience crystal-clear MOMENTUM sound without being attached to a cable. This high-resolution headset sets the benchmark for performance, style and comfort in the wireless headphone category. Bluetooth technology is integrated with engineering expertise to ensure MOMENTUM signature sound remains intact. Near Field Communication (NFC) is provided for effortless “at a touch” Bluetooth pairing with any NFC-enabled device. Further enhancing the audio experience is Noise Gard hybrid active noise cancellation that virtually eliminates unwanted ambient sound. Your voice will sound crystal clear during phone calls thanks to ; dual built-in microphones that dynamically cancel out external interference for perfect speech intelligibility. MOMENTUM Wireless features an iconic design using premium materials like stainless steel and real leather. New, slightly larger ear cups using ergonomically designed, memory foam cushions provide extreme comfort for long listening sessions. The stainless steel headband is now foldable for easy and compact storage in the supplied premium carry case. You can enjoy MOMENTUM Wireless everywhere!. For any further queries, please reach out to Sennheiser's technical support @ 877-736-6434 Extension 3 (hours of operation are 8:30 AM - 5 PM M-F) or http://en-us.sennheiser.com/service-support-contact-center-technical-support