Technical specifications are subject to change. 1GB = 1 billion bytes; actual formatted capacity less. Up to 5 hours of talk time depends on network configuration. Up to 16 hours of battery life refers to music playback. Up to 5 hours of battery life is based on H.264 1.5-Mbps video at 640-by-480 resolution combined with 128-Kbps audio. Rechargeable batteries have a limited number of charge cycles and may eventually need to be replaced. Battery life and number of charge cycles vary by use and settings. See www.apple.com/batteries for more information.