The Apple Digital AV Adaptor routes digital audio to screens that support it. Connect the Apple Digital AV Adaptor to your iPad, iPhone 4, iPhone 4S or iPod touch (4th generation) via the 30-pin dock connector, & to your HDMI-compatible display using an HDMI cable (sold separately). A second 30-pin connector built into the AV adaptor lets you charge & sync your device while itâs connected to your HDMI-compatible display.