Shortly after release, the i Pod Nano became the highest-selling MP3 player in history, being more successful than its discontinued sibling, the i Pod Mini.
Instead of the hard disk which is used in the i Pod Classic, the Nano uses flash memory.
Improvements are that the screen size is bigger, and the battery life grew from 14 hours, to 24 hours.
On October 13, 2006 Apple announced a new "Product Red" i Pod Nano with 4GB of storage.
i Pod Nano 1g users can actually report their unit and recieve a free replacement, users can recieve an i Pod Nano 7g with 16gb in silver color.
The next i Pod Nano was released on September 12, 2006 a year later than it's older brother.
On September 9, 2008 at the Lets Rock Event, Apple released the fourth generation i Pod Nano.The lack of the remote connector found on the top of many previous models means that a number of third-party accessories do not work with the i Pod Nano; newer versions using the dock connector have been made.The first generation i Pod Nano did not support voice recording; the second and third generation Nanos function with third-party recording attachments.The three pre-installed games are variations on the Brick, Solitaire, and Music Quiz games found in the first and second-generation i Pod Nanos.Brick is now called Vortex and there is now a circular playing field.The i Pod Nano also introduced an accelerometer so when you tilted it sideways you could search the cover flow, which had a totally different interface like the i Pod Touch cover flow.Product Red was only available on Apple's website at the retail store.The new i Pod Nano looked alot like the i Pod Mini line.It was available in several different colors, (Silver, Green, Pink, Blue, and Black) but unlike the second generation i Pod Mini and the first generation i Pod Nano, the click wheel is gray on the i Pod Nano second generation except for the black edition.The i Pod Nano includes a stop watch and a multiple time zone clock function.There is also a combination lock feature that makes use of the click wheel to lock the i Pod, and serves to secure the user's calendar and contact information as well as the volume limit function.