Cosmos White color set Charging Dock Cradle with audio output + White Extender 30-Pin Converter for iPhone 4 4S , iPod , iPad 2 3 + Free Cosmos Cable Tie
This is a simple design and easy to use product. Use to charge and transfer data. Connect to a audio cable and play music through a sound box. Audio interface:3.5mm connector.It's a more convenient way of charging and syncing your iphone with the extender.