The Audio Technica ATH-SR6BTBK Over-Ear High Resolution Bluetooth Headphones with Microphone let you enjoy amazing, high-fidelity audio whether you choose to listen over a traditional wired connection or Bluetooth. Powerful 45 mm. drivers are capable of reproducing Hi Res Audio (5 Hz–40 kHz frequency response) when used with the included cable. The over ear headphone design provides excellent sound isolation for the best listening experience in both wireless and wired modes. When traveling, the earcups fold in on the headband for a space-saving fit in the included carrying pouch.Communication System: Bluetooth Version 4.1