Your device is most likely a KT2 - although there are at least six touch screen models.
**but** to be sure (both you and we need to know, this is a technical forum) -
Check the first four (or six) characters of your device serial number against this table:
https://wiki.mobileread.com/wiki/Kindle_Serial_Numbers
You will need that nickname information if the device stops working (and if it isn't working, you can't look it up on the device, you have to go to your Amazon account).