The Sennheiser Accentum Special Edition headphones with BTD 600 Bluetooth dongle deliver masterful sound for home and on the go. With hybrid active noise cancellation, you can fully immerse yourself in your music or use the transparency mode for environmental awareness. The included USB-A to USB-C adapter allows for easy connection to PC and Mac. The integrated 5-band equalizer and adjustable sound modes ensure precise HD stereo sound. The headphones offer a battery life of 50 hours and a frequency response of 10 Hz to 22,000 Hz. The black and copper finish is both elegant and functional.