The Koss KPH40 Utility On-Ear Headphone is part of the Koss Utility Series, an all-new listening experience that features three new headphones, three new cords and one seamless experience where everything works together. No batteries, no audio compromises, no compatibility issues. It's that simple. Included with every Koss Utility Series Headphones is a detachable 3.5mm standard headphone jack cord. Need more options? Bundle the available USB-C or Lightning Utility cords (includes in-line microphone & remote) and connect to other devices you own. Koss Utility Series features a detachable cord system giving listeners the flexibility to seamlessly swap between devices, allowing you to connect to the devices you own now or in the future. What's Included? KPH40 Utility, 3.5mm Utility Cord.