If precision and attention to the finest details are the marks that Definitive Technology lives by, then Symphony 1 is a true embodiment of that spirit. With Bluetooth connectivity, active noise cancelling (ANC) technology, and 50 mm drivers for the broadest and richest soundstage, Symphony 1 is the ultimate headphone for the most discerning audio aficionados. Symphony 1 also features a rechargeable Lithium-ion battery that that last up to 15 hours with noise cancellation engaged. Plus, its tactile on-ear controls include ANC and Bluetooth, and buttons to change tracks, volume, play/pause and take phone calls. And you get included cables for even more ways to listen. Featuring premium materials and a magnificent build quality that offers a plush, comfortable fit, Symphony 1 is a must for any audiophile.