American Anko AVB Retractable Earphones for iPod and MP3 Players Compatibility: iPod mini; iPod nano 1G, 2G, 3G; iPod touch; iPod 1G, 2G, 3G, 4G, 5G, 5.5G, 6G; iPod shuffle 1G, 2G; any MP3 player with a headphone jack High-quality earphone speaker with sensitivity, 85dB +/- 2dB at 1mW, cM Frequency response: 20-20000Hz Normal input power: 5mW; maximum input power: 10mW