Charge and sync your ipod shuffle top-load USB port for easy access Fully compliant with USB 2.0 specification Backwards compatible with USB 1.1 Maximum data transfer rate is 480 Mbps Connectors up to 2 devices without a power adapter Individual port over-current protection Plug-and-play No driver installation required Indicator light status 1 Power LED For PC users Pentiunm processor-bassed computer with USB 2.0 port available Windows 98SE,2000,Me,or XP For Mac Users Mac OS 8.6 or higher for USB 1.1 mode Mac OS X v10.2.7 or higher for USB 2.0 mode.