Can't tell whether your iPod Touch is a 1st, 2nd, 3rd or 4th Generation iPod Touch? Read this guide to find out what generation your iPod Touch is.
iPod Touch 4
The iPod Touch 4 is easily identified. Simply check how many cameras your iPod Touch has. If the iPod Touch has two cameras, one on the front and one on the back, then it is an iPod Touch 4.
iPod Touch 2 or 3
To tell whether your iPod Touch is a 2nd or 3rd generation have a look at the back of it. Down the bottom where the writing is you will see either two or three lines of writing. If there are 2 lines of writing then your iPod Touch is a 3rd generation. If there are three lines of writing then it is a 2nd generation iPod Touch. See the picture below: