Feature: * Use MP3 Headphones Model KM-938 * Impedance: 16Ω * Speaker size: 10mm * Sensitivity: 93db * Plug 3.5 (Φmm) brand-neutral * Frequency range 18-20K (Hz) * Wire length 1.2 (m) http://www.chinabuye.com/kanen-km-938-earphone-headphone-for-mp3-player-mp4-player