The durable and sleek Smart-Trek Mini headsets are versatile and compatible with a wide variety of technologies including Chromebooks, PCs, Macs, and any device with a 3.5mm port. Designed to stand up to the K-12 environment, Smart-Trek headsets are built to last and 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. The headband easily adjusts to fit students of all ages. The cushy ear cups are made with high-quality leatherette cushions that are easy to clean, durable, and provide excellent noise-isolation. Smart-Trek Mini headsets also feature the trusted, exclusive Dura-Cord – the chew, kink and knot-resistant, PVC-jacketed, braided nylon cord. As it is imperative that headsets perform at high levels, whether in-class or at-home, Smart-Trek Mini headsets are a great choice for use in any environment." "Speaker Drivers: 40mm Frequency Response: 50-20000hz Sensitivity: 100dB plus and minus 4dB Impedance: 32 ohms Black/Silver Color 120 degree 3.5mm TRRS Stereo with In-Line Volume Control Leatherette Ear Cushions Padded/Plastic Headband 5 ft Dura-Cord Prop 65 Compliant"