UR18Superior Sound in a Collapsible Lightweight PackageThe UR18 delivers digital quality sound in an ultra-lightweight design for listeners on-the-go. The UR18 features dynamic elements for a wide frequency response from 25-15,000 Hz. Closed leatherette earcushions form a light seal around the ears, enhancing bass frequencies.The UR18 wears comfortably even after hours of continuous listening. An adjustable headband accommodates all head shapes and sizes for maximum comfort. When not in use, the resilient, lightweight frame folds into a compact configuration that's protective, easy to carry and convenient to store. Perfect for travel, the UR18 includes a straight dual-entry eight-foot cord. A 3.5mm (1/8") plug, L-shaped to minimize cord stress are included.The UR18 will delight listeners seeking heavyweight sound in a comfortable lightweight package.Built to last, the UR18 is covered by Koss is covered by Koss' No*Questions*Asked Lifetime Warranty. UR18 Frequency Response 25-15,000 Hz Impedance 32 ohms Sensitivity 92 dB SPL/1mW Distortion < 0.3% Cord Straight, Dual Entry, 8ft