Versatile and compatible with a wide variety of technologies, Smart-Trek headphones are built to last and designed to stand up to the K-12 environment. They are rugged and comfortable, the headband easily adjusts to fit students of all ages. The ear cups are made with high-quality leatherette ear cushions that are easy to clean, durable, and provide excellent  noise-isolation. Smart-Trek headphones feature the trusted Dura-Cord™ - the chew, kink and knot- resistant, PVC-jacketed, braided nylon cord. Other features include in-line volume control, and a 3.5mm TRS plug.