Apple iPod nano 4th Generation (PRODUCT) RED (PRODUCT) RED (4 GB) for sale online | eBay
What are the differences between the iPod nano 4th Gen models? What are the differences between these models and the iPod nano 3rd Gen models they replaced?: EveryiPod.com
iPod Nano 4th Generation Teardown - iFixit
MB911LLA Apple iPod Nano 4th Generation 16GB Orange, Like New Condition!