Califone HPK-1540 Washable Titanium Series Headphone with Guaranteed for Life Cord, 3.5mm plug with 1/4-Inch adapter Softer, more comfortable ear cushions Comfort strap for longer wearability Adjustable headstrap rugged enough for daily classroom use. Detachable 6 feet cord is Guaranteed for Life. In-line volume control Earcups offer the highest passive ambient noise rejection, effectively blocking external distractions to keep students on task 3.5mm plug with 1/4 Inche adapter, Protective slotted baffles guard against perforation of the speakers.