Smart-Trek Deluxe Stereo Headphones with In-Line Volume Control and 3.5mm TRRS Plus The durable and sleek Smart-Trek deluxe headphones are versatile and compatible with a wide variety of technologies. Designed to stand up to the K-12 environment, Smart-Trek headphones are built to last. Smart-Trek feature a rugged and comfortable design, so teachers can have headphones that will function for years, and students can wear the headphones for an extended period of time. Its adjustable headband snaps easily into place 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 a durable, flexible, steel-reinforced gooseneck microphone and trusted Dura-Cord™ - the chew, kink and knot-resistant, PVC-jacketed, braided nylon cord.