Apple MB686LL/A 2GB iPod shuffle - Green - Clamshell Package 2GB, up to 500 songs Earphones - 20Hz to 20,000Hz Frequency response, 32 ohms Impedance Battery Life - Up to 12 hours of skip-free audio playback Connects to a PC or Mac via USB 2.0 through the included dock Durable anodized aluminum enclosure