Contour frame for a comfortable fit. Limited lifetime warranty. 60-20,000Hz. 16 Ohms. 98 dB SPL. 4ft/1.2m. 3.5mm. Koss KE5earbuds are the ideal accessory for the on-the-go music lover. Durability, portability and the sound of Koss are all seamlessly packed together in this sleek earbud. Its contour frame will fit comfortably and securely for extended use.