iPod Dock (2003)

When the iPod switched its connector from a FireWire port to the proprietary 30-pin Dock Connector, several new compatibility and hardware features became available. Because the Dock Connector handled data, sound, and charging capabilities, a variety of connection options were available. 

The iPod Dock allowed a connected iPod to simultaneously charge, send sound to an external stereo system through a line-out port in the back, and respond to commands from an Apple Remote control device.

Source: Apple-History.com

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