Harman Kardon Premium Recertified Bluetooth Over-Ear Headphones Sonic clarity and accuracy even at low volume levels. The headphones need to be charged first thing out of the box. They do not come charged. This takes about 2 hours to charge. Charging cable included, Item may come repackaged. These headphones are Bluetooth and are wireless. The only time that a wire is/would be used is to charge the headphone battery. Customers need to hold the BT button down for at least 2 seconds to turn the headphones on and off. Harman Kardon's factory recertified items are products which may have been purchased and opened by a consumer, but have been tested, inspected, repaired, and repackaged by Harman Kardon to meet factory specifications Harman re-certified products have the same product warranty as new products. In case of any queries kindly contact Customer service @ (800)336-4525, support@us.jbl.com