Smart-Trek Mini Headset with In-Line Volume Control and 3.5mm TRRS Plug The durable and sleek Smart-Trek Mini Headsets are versatile and compatible with a wide variety of technologies. Designed to stand up to the K-12 environment, Smart-Trek headsets are built to last. Smart-Trek school headsets feature a durable and comfortable design, so teachers can have headsets 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 Mini headphones feature the trusted, Dura-Cord™ - the chew, kink and knot-resistant, PVC-jacketed, braided nylon cord.