All day long wearing comfort! An auricle-curve, against-the-ear design with three sizes of foam earpiece cushions ensures a pleasant, non-intrusive experience. A rigid, behind-the-head harness-wire eliminates the potential for cable tangles while staying completely out of your way. Powerful and efficient, 13 mm drivers deliver detailed, full-frequency sound with excellent ambient noise-cancelling. Rechargeable, 100 mAh battery provides up to three hours of continuous operation on a single charge. Bluetooth® 4.2 wireless operation. 33-foot wireless range.