A proprietary TriPort® acoustic structure and Active EQ technology produce exceptionally balanced sound in around-ear headphones for a superb listening experience, with full lows and clear highs. They use Bluetooth connectivity to interface with your devices, meaning you won't be tied down by wires, and the rechargeable lithium ion battery will last up to 15 hours, so you can go all day on a single charge. For added convenience, a built-in mic with HD Voice allows you to take phone calls on the go while maintaining top-notch clarity on both ends. Soft, cushioned earcups provide a comfortable fit, and durable construction ensures years of enjoyment from a sleek, easily packable fold-flat design. Headphone style: Over-ear, with cushioned earcups, Active EQ technology and TriPort acoustic structure to project lifelike sound and reveal musical nuancesIncludes: Headphones, USB charging cable, backup audio cable, carrying caseWireless connectivity: Bluetooth-compatible, with 30-foot wireless rangeSystem compatibility: Compatible with Bose Connect appAdditional features: Built-in mic with HD voice, fold-flat design, Alcantara®-wrapped headband 7.5" x 6" x 1.5" headphones dimensions 7 oz. headphones weight Plastic/metal/rubber/electrical components Imported Authorized Bose dealer