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 topnotch 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