These headphones feature a rich, high quality sound and built-in microphone for easy call answering. Easily pairs to your smartphone or other device via bluetooth technology. Bluetooth operating distance of up to 30 feet. Powerful, high performance bass and treble sound. Light weight and adjustable for a comfortable fit. Folds up for easy storage and travel. Integrated buttons allow you to answer calls through the headset, adjust volume and skip music tracks. Built-in lithium battery. Charging time: 1-2 hours after first 4 hour charge. Playback time: approximately 10 hours. Zippered EVA molded travel case and Brookstone box included