Portable MP3 FM

1GB, up to 240 songs : Earphones - 20Hz to 20,000Hz Frequenc response, 32 ohms Impedance : Batter Life - Up to 12 hours of skip-free audio plaback : Connects to a PC or Mac via USB 2.0 through the included dock : Durable anodized aluminum enclosure : Built-in clip : Automatic sncing with iTunes : Audio formats supported - AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, and 4), WAV, and AIFF : Sstem Requirements - iTunes 7.7 or later, USB 2.0 port, Windows Vista or Windows XP Home or Professional with Service Pack 2 or later, Mac OS X v10.4.10 or later : Unit Dimensions - 1.62 x 1.07 x 0.41 (including clip) : Unit Weight - 0.55 oz.