Amongst the changes were rounded rather than flaired toggle knobs, the recoil spring was changed from a flat spring to a coiled spring, the bolt head was repositioned and the extractor was strengthened.
The front of controller features bass, treble and volume knobs, a power toggle, LED indicator and a 3.5mm auxiliary jack, while the back features a secondary 3.5mm jack, a powered USB port (allowing for the hookup of Bluetooth-enabling dongles, for example) and a toaster slot for the current and previous generation of AirPort Express routers.