Denon AH-D401 Urban RaverTM Over-Ear Headphones, Black (Discontinued by Manufacturer) 50mm driver & integrated amplifier for explosive sound and booming bass. Rechargeable battery provides 12 hours of listening enjoyment. When the battery runs out, you can still listen to music in passive mode. Memory-foam, pentagonal-shaped ear pads provide superior comfort. Two-axis ear cup articulation for a perfect fit. Denon's patent-pending Control Wheel for control of iPod Touch, iPhone, iPad.