AirPod.
Summary: airport wireless add-on for iPod.
Attaches to bottom of iPod via dock connector.
Mates cleanly; appears to make the iPod ~1 inch taller.
Powered via 4G iPod's "enhanced" battery.
Requires 4G iPod; earlier models not supported.
Streams iPod audio via AirTunes to Airport Express.
Capable of streaming at line level or with volume control.
Enables wireless iPod syncing.
Includes "pass through" dock connector on bottom, allowing iPod, with AirPod attached, to operate while docked or with other external dock connector power source. Additional dock connector accessories can therefore be "piggy-backed" onto AirPod.
$99