It is always question with your iPhone, iPad, iPod touch to identify your model is from which generation as Apple always says with their new release of their iOS that this version will work only with & above ‘iPad Generation 4 Models’.
It will also help to idetify other details like Apple Care Protection Coverage & Support, Manufacturing Details, Valid Purchase Date, Telephonic Technical Support if Active & Repair & Service Coverage. Note: it will also work with your Macintosh & other Apple (Hardware) Products.
Then to identify your Generation of Your iPhone, iPad, iPod touch follow this steps
Go to Settings > General > About > Serial Number
Hope it helps…
Thanks & Regards