Here are some ways you can use the iPhone Lightning Dock:
Connect the dock to your computer with the USB cable (included with your iPhone) to sync iPhone and charge its battery.
Connect the dock to an electrical outlet using the Apple USB Power Adapter (included with your iPhone) to charge the battery.
Place your iPhone in the dock and enjoy clear audio during speakerphone calls.
Connect your headphones to the dock so you can listen to music while you sync and charge.
Connect the dock to powered speakers or a stereo using a 3.5 mm cable (sold separately) to play music and podcasts from your iPhone.