Clear conversations Crisp, powerful sound can be expected from the Soundlink II wireless headphones, thanks to proprietary Bose Active EQ and TriPort® technology. The Volume Optimized EQ makes your personal listening experience even better by ensuring superior sound quality regardless of the listening volume.For quality wireless calls from your smartphone, count on an enhanced sidetone feature to make your voice sound more natural, and a dual microphone system that's engineered for clear communication on both ends of the call – so your calls come through loud and clear – even in noisy, windy environments. Easy pairing, seamless device switching Easily connect and control a mobile device directly from the headphones with seamless audio/video sync. Up to two devices can be paired simultaneously. For quick and easy pairing to an NFC-enabled device, simply tap the compatible device to the headphones' right ear cup. You can also switch between two devices, so you can, for example, watch a video while staying connected to your calls. User friendly The state-of-the-art user interface lets you control your music and calls right from your headphones. Helpful voice prompts keep you up-to-date on battery life, which devices you're connected to, and caller ID. Comfortable, durable and long-lasting These headphones are made for your busy life. They're precisely engineered with impact-resistant materials, glass-filled nylon and corrosion-resistant stainless steel. And with soft ear cushions and an Alcantara® fabric headband, these lightweight headphones let you listen in comfort wirelessly via Bluetooth or with the included audio cable. When connected wirelessly, you can listen for up to 15 hours via Bluetooth before requiring a charge. When power is running low, use the included USB cable to power up. A quick 15-minute charge will give you up to two hours of play time. Compact design When you're done listening, they fold smoothly for easy storage in their compact matching case, which comes included. What's In the Box One Pair Bose® SoundLink® around-ear wireless headphones II, USB charging cable, Carrying case, Owner's guide, Warranty card and Optional audio cable. *Battery power consumption depends on factors such as network configuration, carrier network and, signal strength.